. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. AUTOBASIDIOMYCETES 441 distortions on young shoots of Andromeda lignstrina. Galls of this latter form are hollow, bag-like structures which may attain a length of five or six inches. Richards employed the large form on Andromeda and Exo- basidium Vaccinii in some cross inoculations and was able to develop the leaf spot form of the gall on Andromeda from Exo- basidium Vaccinii, and also to produce this same form through spores from the galls on Andromeda. He also directs attention t
. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. AUTOBASIDIOMYCETES 441 distortions on young shoots of Andromeda lignstrina. Galls of this latter form are hollow, bag-like structures which may attain a length of five or six inches. Richards employed the large form on Andromeda and Exo- basidium Vaccinii in some cross inoculations and was able to develop the leaf spot form of the gall on Andromeda from Exo- basidium Vaccinii, and also to produce this same form through spores from the galls on Andromeda. He also directs attention to the fact that the larger distortions in general are produced only during the early part of the year, that is, when the fungus attacks* the young and sensitive tissue. Cross-inoculation work is at- tended with some difficulty on account of the diversity in season of the vari- ous forms, and probably also differ- ences in the susceptibility of the hosts as the season advances. The fungus. The hyphse are fine, much branched, and commonly inter- cellular. They are most abundant in the subepidermal layers, and in the case of the forms producing galls upon the young stems they are more or less con- fined to the cortical parenchyma. The basidia arise directly from the hyphae, pushing up between the epidermal cells. A basidium bears fre- quently four spores, but two to seven may be produced. The spores are elliptical or slightly curved and ordinarily measure 14-17 X 3 /*. Among the basidia, at intervals, may appear certain branched conidiophores bearing small acicular conidia. This is apparently the chief conidial type in the genus Fig. 216. Exobasidium Vaccinii (After Woronin) III. HYMENOMYCETALES Among the higher Basidiomycetes the important forms from the view point of the economic plant pathologist are included in a few families of the Hymenomycetales. This order includes the. Please note that these images are extracted from scanned page images that may have been di
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