. The British rust fungi (Uredinales) their biology and classification. Rust fungi. PHRAGMIDIUM 291 The uredospores of this species are distinguished from those of its allies by being densely and rather coarsely verruculose and very similar to the cseoma-spores, from which, in fact, they differ almost solely in being abstricted singly and not in chains. The oseoma-stage is one of the earliest Uredines of spring, showing on the leaves as soon as they are well developed, and extending even to the calyx. The teleutospores are entirely devoid of papilla on the apical cell ; the gelatinous outer co
. The British rust fungi (Uredinales) their biology and classification. Rust fungi. PHRAGMIDIUM 291 The uredospores of this species are distinguished from those of its allies by being densely and rather coarsely verruculose and very similar to the cseoma-spores, from which, in fact, they differ almost solely in being abstricted singly and not in chains. The oseoma-stage is one of the earliest Uredines of spring, showing on the leaves as soon as they are well developed, and extending even to the calyx. The teleutospores are entirely devoid of papilla on the apical cell ; the gelatinous outer coat is sometimes almost non-existent, and the spores are but slightly changed by boiling in lactic acid. DiSTKlBUTlON: Europe. 2. Phragmidium Potentillse Karst. Puccinia PotentUlae Pers. Syn. p. 229. Phragmidium PotentUlae Karst. Fung. fenn. iv. 49. Plowr. Ured. p. 221. Fischer, Ured. Sohweiz, p. 410, f. 286. Saoc. Syll. vii. 743. McAlpine, Rusts of Australia, p. 188 (?). Arthur, N. Amer. Fl. p. 174. Sydow, Monogr. iii. 97. Spermogones. Few, amphigenous, surrounded by the secidia. JEcidiospores. Cseomata as in P. Fig. 220. Fh. PotentUlae. a, teleutospore x 360 ; 6, the same x 600; c, the same, boiled in laotio aoid for one minute; d, a four-celled teleutospore, boiled and distorted by pressure. Uredospores. Sori hypophyllous, roundish, often confluent, at first covered by the swollen epidermis, surrounded by abun- dant, clavate, curved paraphyses; spores ellipsoid to obovate, finely echinulate, yellow, 21—24 x 16—19 jjl. Teleutospores. Sori hypophyllous, orbicular, soon naked, 19—2. 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 Grove, W. B. (William Bywater), 1848-1938. Cambridge, University Press
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