ISSN 0003-3847
© Finnish Zoological and Botanical Publishing Board 1997

Contents of Volume 34 Number 2, 1997

Berge, G. & Hestmark, G. 1997: Composition of seed banks of roadsides, stream verges and agricultural fields in southern Norway. — Ann. Bot. Fennici 34: 77–90.
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Prieditis, N. 1997: Vegetation of wetland forests in Latvia: A synopsis. — Ann. Bot. Fennici 34: 91–108.
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Hayirlioglu-Ayaz, S. & Beyazoglu, O. 1997: A new species of Alchemilla (Rosaceae) from Turkey. — Ann. Bot. Fennici 34: 109–113.
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Browning, J., Gordon-Gray, K. D., Smith, S. G. & van Staden, J. 1997: Bolboschoenus maritimus s. l. in The Netherlands: a study of pericarp anatomy based on the work of Irene Robertus-Koster. — Ann. Bot. Fennici 34: 115–126.
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He, X.-L. 1997: Type studies on Pycnolejeunea (Lejeuneaceae, Hepaticae). V. On the identity of Pycnolejeunea spinistipula Mizut. and Lepidolejeunea queenslandica Thiers. — Ann. Bot. Fennici 34: 127–132.
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Niemelä, T. & Dai, Y.-C. 1997: Polypore Skeletocutis lenis and its sib S. vulgaris. — Ann. Bot. Fennici 34: 133–140.
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Leskinen, E. & Hällfors, G. 1997: Tabularia waernii (Diatomophyceae) in the northern Baltic Sea. — Ann. Bot. Fennici 34: 141–147.
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Berge, G. & Hestmark, G. 1997: Composition of seed banks of roadsides, stream verges and agricultural fields in southern Norway. — Ann. Bot. Fennici 34: 77–90.

The soil seed banks of three roadsides, one horsetrack, one stream verge and two agricultural fields were sampled in an agricultural landscape in southern Norway. Altogether 61 different vascular plant species germinated from soil samples from the five linear habitats, while only 16 species germinated from the agricultural fields. The low species number and low seed densities in the fields probably reflect modern weed management. Each linear habitat contained more or less specific subsets of plant species. The relative abundance of the different species exhibited an approximately log-normal distribution. Species composition in the seed banks of the linear habitats was compared with the aboveground vegetation. The seed bank had a higher frequency of annual species than the vegetation. Surveys restricted to the aboveground vegetation will tend to underestimate the number of species present by 15–30%.

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Prieditis, N. 1997: Vegetation of wetland forests in Latvia: A synopsis. — Ann. Bot. Fennici 34: 91–108.

Using a synsystematical treatment of 625 relevès following the Braun-Blanquet approach, and correspondence (CANOCO) and cluster (TWINSPAN, GROUPAGE) analyses, 13 communities from 3 classes (Alnetea glutinosae, Querco–Fagetea and Vaccinio–Piceetea) and 7 associations (Carici elongatae–Alnetum, Sphagno squarrosi–Alnetum, Circaeo–Alnetum, Carici remotae–Fraxinetum, Sphagno girgensohnii–Piceetum, Vaccinio uliginosi–Pinetum and Betuletum pubescentis) are distinguished. A brief overview of the community structure, physiognomical, ecological and phytogeographical features is given.

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Hayirlioglu-Ayaz, S. & Beyazoglu, O. 1997: A new species of Alchemilla (Rosaceae) from Turkey. — Ann. Bot. Fennici 34: 109–113.

A new species, Alchemilla trabzonica Hayirlioglu-Ayaz & Beyazoglu (Rosaceae) is described for the Turkish flora. The chief characters of A. trabzonica are appressed-hairy stems and petioles, pedicels appressed-hairy throughout, epicalyx lobes sparsely hairy and sinus open.

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Jane Browning, J., Gordon-Gray, K. D., Smith, S. G. & van Staden, J. 1997: Bolboschoenus maritimus s. l. in The Netherlands: a study of pericarp anatomy based on the work of Irene Robertus-Koster. — Ann. Bot. Fennici 34: 115–126.

Electron microscope scanning results of Bolboschoenus maritimus (L.) Palla sensu lato (= Scirpus maritimus L.) achenes, collected from natural populations in The Netherlands and investigated earlier by Irene Robertus-Koster, are given. Speculative conclusions suggest the variability observed may be the outcome of introgression through earlier generations influenced by ecological effects not adequately understood.

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He, X.-L. 1997: Type studies on Pycnolejeunea (Lejeuneaceae, Hepaticae). V. On the identity of Pycnolejeunea spinistipula Mizut. and Lepidolejeunea queenslandica Thiers. — Ann. Bot. Fennici 34: 127–132.

On the basis of this study, Pycnolejeunea spinistipula Mizut. is transferred to Leptolejeunea (Spruce) Schiffn., as Leptolejeunea spinistipula (Mizut.) He and Lepidolejeunea queenslandica Thiers is transferred to Rectolejeunea Evans, as Rectolejeunea queenslandica (Thiers) He. Complete descriptions and illustrations are provided.

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Niemelä, T. & Dai, Y.-C. 1997: Polypore Skeletocutis lenis and its sib S. vulgaris. — Ann. Bot. Fennici 34: 133–140.

Skeletocutis lenis (P. Karst.) Niemelä is a poroid basidiomycete, living on dead wood and causing a white rot. A study of herbarium material revealed that the common concept of the species includes another species, S. vulgaris (Fries) Niemelä & Y.C. Dai, n. comb. Both species are described and illustrated. Skeletocutis lenis is characterized by perennial basidiocarps, fairly big pores and cylindrical, strongly curved spores; its generative hyphae lack swollen tips at dissepiment edge and hymenium; its skeletal hyphae are mostly > 3 um in diam, bear a distinct lumen, and swell in KOH. Skeletocutis vulgaris is as a rule annual, small-pored, and its spores are cylindrical, moderately curved, and narrower than those of S. lenis. Generative hyphae of the dissepiment edge and hymenium occasionally have a swollen tip. The skeletal hyphae of S. vulgaris are mostly < 3 µm in diam, subsolid without a distinct lumen, and do not change or only slightly swell in KOH. The former has a northerly distribution and prefers fallen trunks of Pinus, while S. vulgaris is more southern and inhabits a wide range of both gymnosperm and angiosperm hosts. These two species have different ecology: S. lenis usually lives on very rotten wood in moist places, while S. vulgaris inhabits recently decorticated trunks, frequently in dry localities. Both species are found in Europe, Asia and North America.

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Leskinen, E. & Hällfors, G. 1997: Tabularia waernii (Diatomophyceae) in the northern Baltic Sea. — Ann. Bot. Fennici 34: 141–147.

Tabularia waernii Snoeijs is a common epiphyte in the Baltic Sea. We have studied its distribution in 313 samples of epiphytic diatoms collected along the SW coast of Finland. T. waernii is abundant in the upper sublittoral of the outer archipelago zone and the sea zone. In the most exposed localities it was present throughout the year, with maximum abundance in June–July. T. waernii was an epiphyte on all filamentous macroalgae examined, however, it clearly preferred Pilayella littoralis as a host alga. It appears to be a slow colonizer, since it was rarely found on the young thalli of any host.

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