. The fungi which cause plant disease . Plant diseases; Fungi. THE FUNGI WHICH CAUSE PLANT DISEASE 397 EricacejE. Cultural work and studies in infection are needed be- fore species can be properly delimited.'' E. vaccinii (Fcl.) Wor. occurs on Vaccinium vitis idaea, forming large blisters on the leaves, rarely on petioles and stems, discoloration red or purple. The fungus appears as a white bloom on the under surface of the leaf; spores narrowly fusiform, 5-8 x 1-2 n. Richards ^ who studied E. vaccinii and E. an- dromedse from inoculations concludes: "Aside from the form of the distortion
. The fungi which cause plant disease . Plant diseases; Fungi. THE FUNGI WHICH CAUSE PLANT DISEASE 397 EricacejE. Cultural work and studies in infection are needed be- fore species can be properly delimited.'' E. vaccinii (Fcl.) Wor. occurs on Vaccinium vitis idaea, forming large blisters on the leaves, rarely on petioles and stems, discoloration red or purple. The fungus appears as a white bloom on the under surface of the leaf; spores narrowly fusiform, 5-8 x 1-2 n. Richards ^ who studied E. vaccinii and E. an- dromedse from inoculations concludes: "Aside from the form of the distortion, E. vaccinii and E. andromedae cannot well be distinguished. The former can produce the same form of distortion on both Gaylussacia and Andromeda and the latter has been made to produce a similar growth on Andromeda. Micro- scopically these forms do not differ. The natural conclusion is that these two species of Exobasidium are one and the same and the form producing large bag-like dis- tortions on Andromeda should be considered a form of E. vac- ; E. ozycocci Rost causes greater hypertrophy than E. vac- cinii, distorting young twigs and leaves; spores 14-17 x 30 n; smaller conidia often present. The myceliiun infests the leaves and stems of the cranberry.^" Morphologically the species agrees closely with E. vaccinii. Infection experiments are needed. E. vezans Mas *^ causes a serious disease on tea. E. andromedae. Fig. 284.—^Exobasidium andromedae on An- dromeda, showing host cells, mycelium, basidia and spores. After Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Stevens, Frank Lincoln, 1871-1934. New York : Macmillan
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfungi, bookyear1913
