A Cytological Study of Uromyces aloes

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Abstract
U aloes is a microcyclic rust developing pycnia and teha on the leaves of Aloe vera. Pycnia are subepidermal and remain abortive and underdeveloped in many cases. Telia are subepidermal and teliospores germinate readily producing usually 2-celled, and rarely 3-celled, promyceha. The terminal cell, which may thus be bi- or trinucleate, is fertile while the nuclei in the lower cell, or cells, degenerate The terminal fertile cell produces an infection hypha which nenetrates into the host. Development of basidiospores has ot been observed, but the terminal cell of the promycelium -assumes the function of basidiospores. A detailed cytological study of teliospore germination has been made. The hap-loid chromosome number, as detd. during the meiotic divi-sions of the fusion nucleus in the promycelium, is 6. In its type of teliospore germination, U. aloes has been shown to resemble Puccinia arenariae, Cintractia montagnei and others which are considered to be basidially bisporous by Buller.