. Comparative morphology of Fungi. Fungi. 436 COMPARATIVE MORPHOLOGY OF FUNGI In some species, the formation of a basidium is preceded by a luxuriant conidial formation. In Hypochnus isabellinus (Tomentella flava) (Bre- feld, 1889), there appear in certain parts of the hyphae, numerous lateral branches which, throughout their whole length, cut off a large mass of red-brown, echinulate spores on short sterigmata (Fig. 278). Before the connection of these spores and Hypochnus was known, they were called Botrytis argillacea. In Hirsutella varians (Matruchotia varians) the hyaline conidia are cut
. Comparative morphology of Fungi. Fungi. 436 COMPARATIVE MORPHOLOGY OF FUNGI In some species, the formation of a basidium is preceded by a luxuriant conidial formation. In Hypochnus isabellinus (Tomentella flava) (Bre- feld, 1889), there appear in certain parts of the hyphae, numerous lateral branches which, throughout their whole length, cut off a large mass of red-brown, echinulate spores on short sterigmata (Fig. 278). Before the connection of these spores and Hypochnus was known, they were called Botrytis argillacea. In Hirsutella varians (Matruchotia varians) the hyaline conidia are cut off over the whole expanse of the mycelium. With the exhaustion of nutri- ent solution, the hyphae collect in coremia which gradually proceed to the formation of "basidia" (Fig. 277). These appear to be connected with conidiophores by a continuous series of intermediate forms (Boulanger, 1893). The name Corticium from cortex, bark, indicates the fructifications of all these genera are resupinate, they are directly con- nected to the hyphal tissue of Hypochnus and in these simple forms are thin, mem- branous, at times arachnoid, while in the higher forms fleshy or leathery, and gener- ally attached to the substrate over the whole expanse; thus the cosmopolitan Cor- ticium vagum (C. botryosum, Rhizoctonia Solani), the cause of Rhizoctonia disease of potato and other vegetables, often subter- Fig isabeiu- sheathing the roots or stems, is nus. 1. Hypha with basidium. 2. > » Portion of a conidiophore. (X350; hypochnoid. C. salmonicolor (C. javani- after Brefdd, 1899.) cum), which causes serious necrosis of bark and twigs of tea, coffee, cacao and cinchona in the tropics, has more luxuriant coverings and a continuous hymenium. In C. Koleroga (Pelli- cularia Koleroga) which causes a thread blight of coffee, the basidia are borne directly on hyphae in mycelial strands covering the under surface of the leaves and extending down the twigs. C. Stevensii (Hypoc
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