ISSN 0003-3847
© Finnish Zoological and Botanical Publishing Board 2006

Contents of Volume 43 Number 1, 2006

Hauck, M., Hofmann, E. & Schmull, M. 2006: Site factors determining epiphytic lichen distribution in a dieback-affected spruce–fir forest on Whiteface Mountain, New York: microclimate. — Ann. Bot. Fennici 43: 1–12.
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Paal, J. & Trei, T. 2006: Vegetation of Estonian watercourses, II. Drainage basin of lakes Peipsi and Võrtsjärv. — Ann. Bot. Fennici 43: 13–35.
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Nuortila, C., Tuomi, J., Aspi, J. & Laine, K. 2006: Early-acting inbreeding depression in a clonal dwarf shrub, Vaccinium myrtillus, in a northern boreal forest. — Ann. Bot. Fennici 43: 36–48.
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Ye, H.-G., Wang, F.-G. & Xia, N.-H. 2006: Croton yangchunensis (Euphorbiaceae), a new species from Guangdong, China. — Ann. Bot. Fennici 43: 49–52.
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Yin, J.-T. 2006: Colocasia tibetensis (Araceae, Colocasieae), a new species from southeast Tibet, China. — Ann. Bot. Fennici 43: 53–56.
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Deng, M., Zhou, Z.-K. & Coombes, A. 2006: Taxonomic notes on the genus Cyclobalanopsis (Fagaceae). — Ann. Bot. Fennici 43: 57–61.
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Yilmaz, Ö. & Kaynak, G. 2006: Linum hirsutum subsp. platyphyllum, stat. nov. (Linaceae). — Ann. Bot. Fennici 43: 62–63.
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Qin, X.-S., Zeng, Q.-W., Xing, F.-W. & Zhou, R.-Z. 2006: Manglietia oblonga (Magnoliaceae), a new species from South China. — Ann. Bot. Fennici 43: 64–67.
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Qian, G.-Z., Liu, L.-F. & Tang, G.-G. 2006: A new section in Malus (Rosaceae) from China. — Ann. Bot. Fennici 43: 68–73.
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Ghahremaninejad, F. & Akhundzadeh, N. 2006: Filago pertomentosa (Asteraceae), a new species from Iran. — Ann. Bot. Fennici 43: 74–76.
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Yilmaz, Ö. & Kaynak, G. 2006: New combination in Linum sect. Syllinum (Linaceae). — Ann. Bot. Fennici 43: 77–79.
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Nomenclatural novelties in Ann. Bot. Fennici 43(1). — Ann. Bot. Fennici 43: 80.
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Hauck, M., Hofmann, E. & Schmull, M. 2006: Site factors determining epiphytic lichen distribution in a dieback-affected spruce–fir forest on Whiteface Mountain, New York: microclimate. — Ann. Bot. Fennici 43: 1–12.

Relationships between microclimatic site factors and cover of epiphytic lichen species were studied in a dieback-affected forest of Picea rubens and Abies balsamea on Whiteface Mountain, New York, U.S.A. Canonical correspondence analysis revealed an effect of light and water relations on epiphytic lichen abundance, but these factors only accounted for less than 10% of total variance in species data. Neither light nor evaporation, relative humidity, water-holding capacity of bark, or air temperature differed at the trunks between trees of different species or vitality. These results suggest that microclimate is probably not the main cause of significant differences in the epiphytic lichen diversity of spruce and fir and of living trees and snags. However, as canopy structure at the study site changed recently due to dense young growth of A. balsamea, it is possible that past differences in microclimate still exert an influence on present-day within-stand variation of epiphytic lichen abundance.

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Paal, J. & Trei, T. 2006: Vegetation of Estonian watercourses, II. Drainage basin of lakes Peipsi and Võrtsjärv. — Ann. Bot. Fennici 43: 13–35.

The general aims of the current study were (i) to continue analyses of the aquatic macrophyte vegetation in the Estonian watercourses, (ii) to develop a classification of the plant communities of the watercourses connected with the two largest lakes in Estonia, Peipsi and Võrtsjärv, (iii) to distinguish the main ecological variables which determine the occurrence of the dominating species and discriminate between the community types and, (iv) to establish a classification of the river reaches (habitats) and to identify the parameters distinguishing them. The data were clustered into 29 vegetation types of which 23 were dominated by vascular plant species, while six clusters included communities of cryptogams. Total N content in water, river width, current velocity and riverbed material proved to be the variables separating the clusters most reliably. The river reaches clustered into three habitat types and were significantly separated by river width and riverbed substrate. In comparison with the drainage basin of the Gulf of Finland several differences arise between the composition of the vegetation types. Comparison of the physical environmental parameters significantly influencing the occurrence of dominating species in the two drainage basins reveals a clear discrepancy as well: bottom coverage with fine sediments and water turbidity are important for the species of the drainage basin of the Gulf of Finland, while the river width, character of the riverbed substrate, and current velocity are significant for the species of the Peipsi–Võrts–järv drainage basin. The rivers of the Peipsi–Võrtsjärv drainage basin have much wider variation in width (5.2–22.1 m) than those of the Gulf of Finland drainage basin (8.1–16.1 m) and in the current study the width of the watercourses is the main parameter discriminating the habitat types. For both drainage basins, current velocity and bottom substrate are of equal significance. For the vegetation types of the Gulf of Finland drainage basin, water BOD5 also appeared to be important, while for the vegetation types of the Peipsi–Võrtsjärv drainage basin, instead of this parameter total N content in water played a significant role.

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Nuortila, C., Tuomi, J., Aspi, J. & Laine, K. 2006: Early-acting inbreeding depression in a clonal dwarf shrub, Vaccinium myrtillus, in a northern boreal forest. — Ann. Bot. Fennici 43: 36–48.

Seed yield reductions upon self-pollination in comparison to cross-pollination can be caused by either self-incompatibility or inbreeding depression. Several ericaceous species have shown partial self-sterility, most probably due to inbreeding depression expressed at seed maturation. We conducted pollination experiments in Vaccinium myrtillus (the bilberry) in a northern boreal forest and used the results on seed production in a regression model to examine the occurrence of inbreeding depression vs. prezygotic self-incompatibility. We also estimated the magnitude of inbreeding depression and the number of lethal equivalents per zygote for bilberry. We estimated an inbreeding depression of [delta] = 0.8 and a mean of 7.8 lethal equivalents per zygote (range of 1–14). These figures are comparable to the estimates made for bilberry at a location in central Europe and for other long-lived plants, and support the observation that longevity is associated with high genetic load.

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Ye, H.-G., Wang, F.-G. & Xia, N.-H. 2006: Croton yangchunensis (Euphorbiaceae), a new species from Guangdong, China. — Ann. Bot. Fennici 43: 49–52.

Croton yangchunensis H.G. Ye & N.H. Xia, sp. nova is described from Guangdong Province, China, and compared with its congeners. It is somewhat similar to C. purpurascens, but is distinguished by its acute apex of leaf blade, with a cupular gland on each side of midrib at base, its longer raceme, and its lanceolate sepals of female flowers, 3.5–4 mm long. It also resembles C. tiglium, but differs in having an entire leaf blade, smaller and oblate fruit, and smaller seeds.

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Yin, J.-T. 2006: Colocasia tibetensis (Araceae, Colocasieae), a new species from southeast Tibet, China. — Ann. Bot. Fennici 43: 53–56.

Colocasia tibetensis J.T. Yin is described and illustrated as a new species of Araceae from southeast Tibet, China. Morphological characters of C. tibetensis and morphologically similar species C. fallax are compared. Colocasia tibetensis differs from C. fallax in its erect (not reflexed) spathe limb, the junction between the lamina and lower convolute part of the spathe being not constricted, having three placentae and stolons 15–35 cm long.

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Deng, M., Zhou, Z.-K. & Coombes, A. 2006: Taxonomic notes on the genus Cyclobalanopsis (Fagaceae). — Ann. Bot. Fennici 43: 57–61.

Three new combinations in the genus Cyclobalanopsis are proposed based on examination of type materials and other specimens. Quercus fleuryi Hickel & A. Camus and Q. macrocalyx Hickel & A. Camus var. tomentosa Metcalf are treated as synonyms of C. macrocalyx and C. kouangsiensis (A. Camus) Y.C. Hsu & H.W. Jen, respectively. The taxonomic treatment of several species in this genus is discussed.

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Yilmaz, Ö. & Kaynak, G. 2006: Linum hirsutum subsp. platyphyllum, stat. nov. (Linaceae). — Ann. Bot. Fennici 43: 62–63.

Linum hirsutum L. subsp. platyphyllum (P.H. Davis) Yilmaz & Kaynak stat. nov. is proposed in the Linaceae. The taxon is a local endemic in northwest Anatolia. There are now five subspecies of L. hirsutum in Turkey.

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Qin, X.-S., Zeng, Q.-W., Xing, F.-W. & Zhou, R.-Z. 2006: Manglietia oblonga (Magnoliaceae), a new species from South China. — Ann. Bot. Fennici 43: 64–67.

Manglietia oblonga Law, R.Z. Zhou & X.S. Qin sp. nova from China is described and illustrated in line drawings. It is most similar to M. forrestii and M. yuyuanensis, from which it differs in its buds, petioles, upper and lower surfaces of leaves and peduncles being golden appressed-pilose, and in its tepals with horizontally undulate striae.

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Qian, G.-Z., Liu, L.-F. & Tang, G.-G. 2006: A new section in Malus (Rosaceae) from China. — Ann. Bot. Fennici 43: 68–73.

A new section in the genus Malus Miller (Rosaceae), sect. Yunnanenses (Rehd.) G. Z. Qian, is segregated from the sect. Sorbomalus Zabel ex Schneid. The new section differs from sect. Sorbomalus mainly by the leaves with more than five shallow lobes (or non-lobed), persistent calyx, five styles in flowers, and subglobose fruits with grit-cells and dots. Four species are placed in sect. Yunnanenses, all of them endemic in China: M. honanensis Rehd., M. yunnanensis (Franch.) Schneid., M. ombrophila Hand.-Mazz. and M. prattii (Heml.) Schneid.

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Ghahremaninejad, F. & Akhundzadeh, N. 2006: Filago pertomentosa (Asteraceae), a new species from Iran. — Ann. Bot. Fennici 43: 74–76.

Filago pertomentosa F. Ghahremani. & Akhundzadeh sp. nova is described from Iran and illustrated. It is compared with the morphologically close F. arvensis.

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Yilmaz, Ö. & Kaynak, G. 2006: New combination in Linum sect. Syllinum (Linaceae). — Ann. Bot. Fennici 43: 77–79.

The endemic Turkish taxon Linum mucronatum Bertol. subsp. gypsicola P.H. Davis var. papilliferum (Hub.-Mor. & Reese) P.H. Davis is transferred to the endemic species L. pamphylicum Boiss. & Heldr. ex Planch. as L. pamphylicum subsp. papilliferum (Hub.-Mor. & Reese) Yilmaz & Kaynak comb. & stat. nov. It is characterised by flowering stems with scabrid ridges, spathulate basal leaves and linear or linear-oblanceolate, papillose or puberulent cauline leaves.

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