A Popular History of British Lichens

abundant acid alpine apothecia apothecium appear Arctic authors bark base beautiful becoming blackish branched British brown brownish cavity cells cellules Cetraria Char characters chiefly Cladonia closely collected colour common comparatively condition consists contains cortical countries covered crustaceous delicate described distinct districts Ditto elongated ends exciple extremities fertile filaments foliaceous frequently fructification genera genus growing habitat Highland hills irregular islands laciniæ layer Lecanora Lecidea less Lichens linear lowland margin matter minute moss mountains naked nature oblong observed occurs organs pale Parmelia Peltigera plants points possess probably produced proper rare regard regions resemble rocks rounded seen showing similar simple smooth sometimes species specimens spermatia spermogones spores sterigmata Sticta stones straight structure subalpine surface thalamium thalline thallus thecæ thick thin tissue trees usually varieties various varying vegetation walls whitish woods yellow yield young