Fungous diseases of plants . nsidered thetypical form of the specieshere discussed. Upon the hostreferred to, pale rose or red-dish, thickened spots are pro-duced. The same speciesoccurs, apparently, on otherspecies of Vaccinium, alsoGaylussacia and other genera,and it may be well brieflyto refer to some of its related forms. No morphological char-acters of the fungus above mentioned have been found whichwould distinguish it from Exobasidium Oxycocci Rostr. on thecranberry {Vaccinium macrocarpon). On the cranberry, however,lateral buds are attacked, and as these exfoliate, a considerableportio
Fungous diseases of plants . nsidered thetypical form of the specieshere discussed. Upon the hostreferred to, pale rose or red-dish, thickened spots are pro-duced. The same speciesoccurs, apparently, on otherspecies of Vaccinium, alsoGaylussacia and other genera,and it may be well brieflyto refer to some of its related forms. No morphological char-acters of the fungus above mentioned have been found whichwould distinguish it from Exobasidium Oxycocci Rostr. on thecranberry {Vaccinium macrocarpon). On the cranberry, however,lateral buds are attacked, and as these exfoliate, a considerableportion of the shoot may become hypertrophied. The affectedleaves are rose colored, and since they remain close together onthe shoot, they are often called false blossoms. A form produc-ing characteristic galls on the young shoots of several species ofrhododendron is generally regarded as distinct, and bears thename Exobasidium Azalea. Finally, there is an unusually largeform described as Exobasidium Andromcdce Pk., which produces. Fig. 215. Exobasidium Vaccinii onRhododendron AUTOBASIDIOMYCETES 441 distortions on young shoots of Andromeda lii^nstrina. Galls ofthis latter form are hollow, bag-like structures which may attain alength of five or six inches. l-vichards employed the large form on Andromeda and Exo-basidiiim Jdccinii in some cross inoculations and was able todevelop the leaf spot form of the gall on Andromeda from Exo-basidiinu Wxccinii, and also to produce this same form throughspores from the galls on Andromeda. He also directs attentionto the fact that the larger distortions ingeneral are produced only during theearly part of the year, that is, when thefungus attacks the young and sensitivetissue. Cross-inoculation work is at-tended with some difificulty on accountof the diversity in season of the vari-ous forms, and probably also differ-ences in the susceptibility of the hostsas the season advances. The fungus. The hyphae are fine,much branched, and commonly inter-cel
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