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De bryophyten-flora van de Drentse hunebedden en zwerfkeien II: De zwerfkeienflora

A. K. Masselink and B. O. van Zanten
Lindbergia
Vol. 4, No. 1/2 (1977), pp. 143-149
Published by: Oikos Editorial Office
Stable URL: http://www.jstor.org/stable/20149275
Page Count: 7
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
De bryophyten-flora van de Drentse hunebedden en zwerfkeien II: De zwerfkeienflora
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Abstract

Supplementary to the bryophytic flora of the cairns (Lindbergia 3: 323-331) other finds of saxicolous, oligotrafent bryophytes, occurring in the north of the Netherlands, are reported. As the granitic and other boulders -- brought here by the Riss- or Saale glaciation -- have strongly diminished in the last centuries, strictly saxicolous species are very rare nowadays. Nevertheless 2 species new to the Dutch bryophyte flora (Grimmia patens and G. hartmannii) have been found recently on boulders in coniferplantations, an environment not existing about a century ago. Other species occurring in this habitat are Racomitrium fasciculare, R. heterostichum ssp. affine, R. heterostichum var. gracilescens, R. aciculare and Grimmia decipiens. The differential characters of Grimmia trichophylla and G. decipiens are discussed and criteria are given to facilitate the identification of non-piliferous forms of Racomitrium heterostichum, R. canescens and R. lanuginosum.

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