. A manual of botany. Botany. THALLOPHYTA—LIOHENE S 95 Class III.—LICHENES. The propriety of considering the Lichens as a separate class is perhaps open to discussion. Before their true nature was understood they ranlsed as such, but when they were ascertained to be largely fungal in their composition, and to contain algae in their tissues, they were perhaps liastily relegated to the Fungi, assuming them to be parasitic on the algae within them. Further study has shown them to be symbiotic organisms, the Fig. f\ % J 'iv • V. ' wV 'J ' Fig. 855. A. Vmea harhata, a fniticose liclieu (natur
. A manual of botany. Botany. THALLOPHYTA—LIOHENE S 95 Class III.—LICHENES. The propriety of considering the Lichens as a separate class is perhaps open to discussion. Before their true nature was understood they ranlsed as such, but when they were ascertained to be largely fungal in their composition, and to contain algae in their tissues, they were perhaps liastily relegated to the Fungi, assuming them to be parasitic on the algae within them. Further study has shown them to be symbiotic organisms, the Fig. f\ % J 'iv • V. ' wV 'J ' Fig. 855. A. Vmea harhata, a fniticose liclieu (natural size). B. Sticta pul- monacpcE, a foliaceous lichen, ft. Apothecia. After Saclis. alga and the fungus living together to the mutual advantage of both. The constituents may also sometimes vary, the same algae growing with different fungi and vice versa. They may consequently be restored to something of their old position. The lichens are thallophytes of various form, living on old trees, rocks, &o., and presenting always a peculiar withered appearance. According to their habit, they may be divided into fruHcose, foUaceous, and crustaceous 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 Green, J. Reynolds (Joseph Reynolds), 1848-1914. London, J. & A. Churchill
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectbotany, bookyear1895
