. The British rust fungi (Uredinales) their biology and classification. Rust fungi. ON RUBIACEiE 167 On Galium Cruciata. Not uncommon. Uredospores, May —July; teleutospores, August, September. (Fig. 116.) Distinguished at once from P. Valantiae on the same host by the dark colour of its teleutospores, and their very great and dark apical thickening. The presence of uredospores also distinguishes them ; in P. Celaiovskyana the two kinds of sori are often present together on the same leaf, the uredo-sori pale brown, and the teleuto-sori almost black. According to Bubak, almpst its only distincti
. The British rust fungi (Uredinales) their biology and classification. Rust fungi. ON RUBIACEiE 167 On Galium Cruciata. Not uncommon. Uredospores, May —July; teleutospores, August, September. (Fig. 116.) Distinguished at once from P. Valantiae on the same host by the dark colour of its teleutospores, and their very great and dark apical thickening. The presence of uredospores also distinguishes them ; in P. Celaiovskyana the two kinds of sori are often present together on the same leaf, the uredo-sori pale brown, and the teleuto-sori almost black. According to Bubak, almpst its only distinction from P. punctata lies in the absence of the secidium whose place is taken by the primary uredo- sori. Wurth reports it also {) on O. pedemontanwm on the continent, but demonstrated by culture-experiments that it could not be transferred to other species of Galium. Most of the records of P. punctata on O. Cruciata probably belong to this species, which certainly shows few morphological distinctions from the former; I find, however, that the teleuto-sori are larger, more numerous, and more compact in this species than in that found on G. palustre. Distribution: Central Europe. 39. Puccinia Valantiae Pers. Puccinia Valantiae Pers. Obs. Myc. ii. 25. Cooke, Handb. p. 500; Micr. Fung. p. 207. Plowr. Ured. p. 212. Sacc. Syll. vii. 685, Sydow, Monogr. i. 217. Fischer, Ured. Schweiz, p. 336, P. acuminata Fokl. ; Cooke, Micr. Fung. p. 208. Teleutospores. Sori hypophyllous, rather thick, pulvinate, compact, orbicular, scattered, circinate or confluent, up to 2 mm. diam., at first yellowish-, then chestnut-brown,atlength greyish-brown (from the spores germi- nating in situ), often elongated and causing distortion on the stems; spores fusoid or slightly oblong, attenuated at both ends, thickened (up to 9 /j.) above, somewhat constricted, smooth, pallid- brown, 36—65 X 10—17 /J,; pedicels hya- line, persistent, up to 80 fi long. On Galium Cruciata, G. saxatile. June—Se
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