. Fungous diseases of plants, with chapters on physiology, culture methods and technique . d c Fig. 195. Uromyces Trifolu: CLo^•^:R Rust PROTOBASIDIOMYCETES 397 advances. These spores are 20-35 ^ 15-22/x, and a spore ger-minates by the production of the characteristic promyceUum, di-vided ordinarily into four cells, each producing its sporidium. Thegermination of the teleutospore would seem to take place ordinarilyseveral weeks prior to the appearance of the spermogonium andaecidium, both of which arise only from teleutosporic accepts the separation of the rust of clovers into
. Fungous diseases of plants, with chapters on physiology, culture methods and technique . d c Fig. 195. Uromyces Trifolu: CLo^•^:R Rust PROTOBASIDIOMYCETES 397 advances. These spores are 20-35 ^ 15-22/x, and a spore ger-minates by the production of the characteristic promyceUum, di-vided ordinarily into four cells, each producing its sporidium. Thegermination of the teleutospore would seem to take place ordinarilyseveral weeks prior to the appearance of the spermogonium andaecidium, both of which arise only from teleutosporic accepts the separation of the rust of clovers into two spe-cies. The absence of stages O, I, also the more numerous germ-pores in II, distinguish the form on red clover from that on Fig. 196. Uromyces APPENDicuLATus: Rust of Beans. (Photograph by H. H. Whetzel) As a rule, control measures seem to be unnecessary; at any rateno practical preventive methods are known. V. RUST OF BEANSUromyces appendiculatus (Pers.) Lev. De Bary, a. Recherches sur le ddveloppement de quelques champignonsparasites. Ann. d. Sci. nat. Bot. (S^r. 4) 20: 68-99. iS^3- Whetzel, H. H. Bean Rust. Cornell Agl. Exp. Sta. Built. 239 : 113-11S. 1906. This fungus is widely distributed, occurring on the bean {Phasco-lus vulgaris) and other related species. It is also reported in south-ern latitudes on relatives of the cowpea, such as Dolichos oniatiiSy 398 FUNGOUS DISEASES OF PLANTS Lablab vulgaris, Vigna marginata, etc. The fungus commonlyappears late in the season, and it is often destructive to foliage,causing early maturity and lessened production of the beans. Thereis great difference in susceptibility of varieties both among dwarfand pole sorts. Moreover, the fungus is harbored
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