. Fio. 258.—Exobasidium vaccinii. Germinating basidiospores. The septate spores have given off germ-tubes which penetrate into the cowberry leaves, either by stomata or through the epidermis. The lowest spore is forming conidia. (After Woronin.) This Exobasiclium is very common on the cowberry (Vaccinium Vitis-Idaca)} It occurs less frequently on the bilberry {Vac- ' Several American Ericaceae are given as in the " ;

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