312 CHRYSOMYXA 
2. Chrysomyxa Pyrole Rostr. 
icidium Pyrolae DC. Flor. Fr. vi. 99. 
Trichobasis Pyrolae Berk.; Cooke, Handb. p. 529; Micr. Fung. 
p. 223 p.p. 
Chrysomyxa Pyrolae Rosty. Bot, Centr. iii. 126 (1881). Plowr. Ured. 
p. 253, Fischer, Ured. Schweiz, p. 429. Sace. Syll. vii. 761. 
Melampsoropsis Pyrolae Arthur, N. Amer. FI. vii. 118. 
Uredospores. Sori hypophyllous, often covering the whole 
surface uniformly, roundish, 3—1 mm. 
diam., soon naked, surrounded by the 
torn epidermis and a very delicate 
evanescent peridium, yellow; spores 
in chains, roundish or polygonal, 
verrucose, orange, 21—28 x 18—21 pu. 
Teleutospores. Sori hypophyllous, 
covering the whole leaf-surface uni- 
formly, up to $ mm. wide, roundish 
or oblong, flat, waxy, yellowish- then 
blood-red, when dry brown; spores 
ellipsoid, about 8 « wide, in rows as 
much as 100—120 wu long. 
On Pyrola minor, P. rotundifolia 
and its var. P. maritima. Uncom- 
mon; Edinburgh, Kew Gardens, 
Fig. 236. C.Pyrolae. a, uredo- Lancashire, ete. April— August. 
sori, on underside of leaf, . 
nat. size; b, chains of young (Fig. 236.) 
, showing inter- . . ‘ 
ee : - oa This parasite may possibly be heterce- 
dospore. On P. maritima cious; Fraser (Mycologia, 1911, iii. 67) 
Grecides) ex herb. H. J. syooests that Peridermium conorum-Piceae 
. is its ecidium ; Rostrup, Arthur, and Kern 
had already expressed the same idea. The 
teleutospores are rarely formed, and the fungus probably maintains 
itself by its uredospores, which can be distinguished from those of 
Pucciniasirum Pyrolae by their sori keing scattered (not in groups), and 
by the absence of a distinct peridium. 
DisTRIBUTION: Europe, North America. 
