File:The natural history of plants, their forms, growth, reproduction, and distribution; (1902) (14763408004).jpg

Identifier: naturalhistoryof02kern (find matches)
Title: The natural history of plants, their forms, growth, reproduction, and distribution;
Year: 1902 (1900s)
Authors: Kerner von Marilaun, Anton, 1831-1898 Oliver, Francis Wall, 1864- Macdonald, Mary Frances Ewart Busk, Marian Balfour, Lady
Subjects: Botany
Publisher: London, Blackie
Contributing Library: NCSU Libraries
Digitizing Sponsor: NCSU Libraries

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of these supposed species have to be suppressed. Among the simpler forms may be mentioned Podospora, which produces solitarysessile perithecia upon its mycelium. Polystigma rubrum, which occurs on theleaves of species of Cherry and Plum, produces a brilliant red spotting on the leaves.The mycelium permeates the internal tissues, and during the summer the conidialreceptacles or pycnidia are formed. Later, usually in the following spring, in thefallen leaves, the perithecia arise, and the ascospores now liberated infect the youngfoliage in the vicinity. Nectria cinnabarina, another fairly simple form, occurs aslittle red cushions on the branches of Horse-Chestnut, Elm, Sycamore, &c.; thesecushions burst through the bark budding ofi conidia (this is the bright red stage),whilst later, as tiny lobes, the perithecia arise upon them, each lobe containing asingle perithecium (this is the dull crimson stage). The number of simple parasiticPyrenomycetes is almost endless. THALLOPHYTA. 679
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^ /^ 4^57 Fig 385.-Ascomycetes. in section. ; J^^^^^^^^, „( £u,o«iu». bearing a conid.al hypUa (^^ »;, j. tangled hyplu« from ^vhich a fnnt 680 THE SUBDIVISIONS OF THE VEGETABLE KINGDOM. Of complex forms with ctromata we may mention Gordyceps, Xylaria, andClaviceps. Cordyceps militaris and other species attack caterpillars. The germ-tube having once effected an entrance into the body of the caterpillar and estab-lished itself in the superficial layers begins to sprout vigorously, these sprouts beingcarried in the blood to all parts of the body. The sprouts now grow into hyphse,and gradually the whole caterpillar is replaced by a dense fungal tissue whicl-

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