. A handbook of cryptogamic botany. Cryptogams. Fig. 49.—Aspleniutn decussat-um ; adventitious bud, k, already rooting (natural size). Fig. 50.—Young sporophyte of Adiantum capillus-Veneris still attached to prothallium p ; ^, first leaf; w', w", ist and _2nd root; ht rhizoids of prothallium (X30). (After Goebel.) species of Trichomanes no subsequent roots are formed, their place being supplied by underground branches. The mature fern varies in size from that of the 'filmy ferns,' species of Hymenophyllum not above an inch in height, with delicate moss- like habit, to the stately ' tree-f
. A handbook of cryptogamic botany. Cryptogams. Fig. 49.—Aspleniutn decussat-um ; adventitious bud, k, already rooting (natural size). Fig. 50.—Young sporophyte of Adiantum capillus-Veneris still attached to prothallium p ; ^, first leaf; w', w", ist and _2nd root; ht rhizoids of prothallium (X30). (After Goebel.) species of Trichomanes no subsequent roots are formed, their place being supplied by underground branches. The mature fern varies in size from that of the 'filmy ferns,' species of Hymenophyllum not above an inch in height, with delicate moss- like habit, to the stately ' tree-ferns' of the Southern Hemisphere (Cyatheaceae and Dicksonia, L'Herit.), fifty or sixty feet in height. The stem is either ascending and vertical, or creeping on or beneath the surface of the soil, or occasionally scandent (Lygodium, Sw.), often very short with undeveloped internodes, and the leaves so crowded that fre- quently no portion of the stem—then often called a caudex—remains exposed ; while in the creeping and climbing species the leaves are often. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Bennett, Alfred W. (Alfred William), 1833-1902; Murray, George Robert Milne, 1858-. London, New York, Longmans, Green, and Co.
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