Text-book of structural and physiological botany . Fig. 412.—I. Longitudinal section through the thallus of a Gelatinous Lichen, Mal-lotiuni Hildenbra7tdii {x igo) ; IL piece of a very thin section through theunder side with moniliform chains of gonidia (after De Bary, x 390). it consists of gonidia and narrow filaments of cells imbeddedin an apparently homogeneous jelly. The contents of thecells are always colourless and invisible, and apparentlycontain no organised constituents such as grains of cell-walls of many Lichens (as, ^ the so-called ^Ice-land moss, Cetraria islandica
Text-book of structural and physiological botany . Fig. 412.—I. Longitudinal section through the thallus of a Gelatinous Lichen, Mal-lotiuni Hildenbra7tdii {x igo) ; IL piece of a very thin section through theunder side with moniliform chains of gonidia (after De Bary, x 390). it consists of gonidia and narrow filaments of cells imbeddedin an apparently homogeneous jelly. The contents of thecells are always colourless and invisible, and apparentlycontain no organised constituents such as grains of cell-walls of many Lichens (as, ^ the so-called ^Ice-land moss, Cetraria islandica)^ swell up, when boiled inwater, into a homogeneous jelly, forming the so-called* moss- or lichen-starch, or Lichenin. Among the organs of reproduction of Lichens are thesoredia (Fig. 409 iv.), which are developed in the gonidial 288 Siriicht7al and Physiological Botany, layer ; groups of gonidia becoming enclosed in peculiarfibrous envelopes, and, when so completely inwoven, grow-ing rapidly, and thus exercising a pressure on the cortexwhich
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Keywords: ., bookcentury1800, bookdecade1870, bookpublishernewyorkjwileysons
