Fungous diseases of plants . I-k;. 22\. RlllZoCTliNIA ()\ 1>K.\N Stems and Puds. (Photograph byH. H. Whetzel) AUTOBASIDIOMYCETES 451 In the case of the potato, it forms a membranous layer inclos-ing the stem for several inches above the surface of the layer is composed of rather loosely interwoven hyphae, andon account of this character it is difficult to say if the plant isproperly placed under the genus Corticium, or whether it mightnot with equal propriety be considered a species of basidia are short, cylindrical, or oblong, and apparently many. Vic. 222. CORTIC
Fungous diseases of plants . I-k;. 22\. RlllZoCTliNIA ()\ 1>K.\N Stems and Puds. (Photograph byH. H. Whetzel) AUTOBASIDIOMYCETES 451 In the case of the potato, it forms a membranous layer inclos-ing the stem for several inches above the surface of the layer is composed of rather loosely interwoven hyphae, andon account of this character it is difficult to say if the plant isproperly placed under the genus Corticium, or whether it mightnot with equal propriety be considered a species of basidia are short, cylindrical, or oblong, and apparently many. Vic. 222. CORTICIVM VAGUM ^?AK. SoLANIa, young hyphje ; /, cells from growth in tufts ; f, basidia and spores may be produced from a single parent hypha, each basidium beingcut off from the hypha by a septum placed in the manner charac-teristic of the branching mycelium. The basidia bear four sterig-mata and spores, although commonly only two may be observedat one time. The spores, according to Rolfs, are somewhat ellip-tical or irregular in outline, frequently obovate and nearly hyaline,9-15 X 6-13/x. Spore germination proceeds in ordinary nutri-ent media, and as a rule a septum is formed in the germ tubeshortly after it emerges from the spore, the proximal portion ofthe germ tube being somewhat less in diameter. When produced 452 FUNGOUS DISEASES OF PLANTS upon the majority of hosts the Corticium stage disappears by thetime the host plant is dead. A considerable amount of study is demanded in order that it maybe determined what may properly be considered species or varietieswithin
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