312 CHRYSOMYXi 



2. Chrysomyxa Pyrolae Rostr. 



Y. vi. 99. 



1 !.'•. Handb. i>. 



529; Micr. Fun-. 



. /.'• idiwm Pyrolae l>< '. Flor. 

 TVichobasis Pyrolae Berk. 



p. 223 p.p. 

 Chrysomyxa Pyrolae Rostr. Bot. Centr. iii. I ^G (1881). Plowr. Ured. 



p. 253. Fischer, [Jred. Schweiz, p. 429. Sacc. Syll. vii. 761. 

 Melampsoropm Pyrohn- Arthur, X. Amer. Fl. vii. I Is. 



Uredospores. Sori hypophyllous, often covering the whole 



surface uniformly, roundish, h — 1 nun. 

 diam., soon naked, surrounded by the 

 torn epidermis and a very delicate 

 evanescent peridium, yellow: spores 

 in chains, roundish or polygonal, 

 verrucose, orange, 21 — 28x18 — 21 /x. 

 Teleutospores. Sori hypophyllous, 

 covering the whole leaf-surface uni- 

 formly, up to I mm. wide, roundish 

 or oblong, flat, waxy, yellowish- then 

 blood-red, when dry brown ; spores 

 ellipsoid, about 8 fx wide, in rows as 

 much as 100 — 120^ long. 



On Pyrola motor. P. rotundifolia 

 and its var. P. maritima. Uncom- 

 mon ; Edinburgh, Kew Gardens, 

 Lancashire, etc. April — August. 

 (Fig. 236.) 



Fig.236. ('.Pyrolae. a.uredo- 

 sori, on underside of 

 nat. size ; b, chains of young 

 uredospores, showing inter- 

 calary cells; c, mature ure- 

 dospore. On I', maritima 

 (Formby, ex herb. H. J. 

 Wheldon). 



This parasite may possibly be heteroe- 

 cious ; Fraser (Mycologia, 1911, iii. 67) 

 suggests that Peridermium conorum-Piceae 

 is its secidium ; Rdstrup, 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 he distinguished from those of 

 Pucciniasirum Pyrolae by their sori being scattered (not in groups), and 

 by the absence of a distinct peridium. 



Distribution : Europe, North America. 



