KUEHNEOLA 301 



and paler, when old whitish; spores globose, obovate or irregu- 

 larly polygonal, closely verruculose-echinulate, yellow, about 

 20 — 26 fi; pores indistinct (? three or four). 



Teleutospores. Sori hypophyllous, singly or in little round- 

 ish groups, but never confluent, \ — £ mm., pulvinate, yellowish- 

 white ; spores cylindrical-clavate, flattened and irregularly 

 coronate at the summit, of 2 — 13 (mostly 5 or 6) trapezoidal 

 cells which are smooth and colourless, each measuring 17 — 30 

 x 15 — 25 fi; the wall of each cell becomes thicker from below 

 upwards, and the upper edge is irregularly undulated ; the 

 germ-pore is situated in one of the finger-like projections at 

 the upper edge of each cell ; pedicels very short, sometimes 

 wanting ; each cell is really a perfectly distinct spore. 



On Rub us fr.uticosus. Not rare; Taunton, Hereford, 

 Worcestershire, Woolmer, New Forest, North Wootton, Ayrshire, 

 Ireland, etc. Teleutospores, September — November. (Fig. 227.) 



The life-history of this species is imperfectly known. The uredospores 

 may precede the teleutospores, but may also be found simultaneously with 

 them and (presumably the secondary uredospores) even in the same sorus. 

 The primary uredospores seem to occur in chains, represent secidiospores, 

 and probably germinate at once. The teleutospores germinate in situ on 

 the leaves as early as the beginning of September. Juel, who experi- 

 mentally demonstrated the connection of the two spore-forms, suggested 

 that some uredospores survive the winter and germinate in the spring ; 

 J. Midler and S. Strelin state the same of the secondary uredospores. 



This species is said to be found on Rubus caesius ; it occurs on many 

 species of Rubus in North America. The name given by Arthur 

 (K. Uredinis) rests upon a (probably true) idea that the teleutospores 

 constitute the fungus named by Link Oidium Uredinis and placed among 

 the Hyphomycetes : see Sacc. Syll. iv. 16. 



Distribution : Europe, North America. 



2. Kuehneola Tormentillae Arthur. 



I'h ray, iridium Tormentillae Fckl. Symb. Myc. p. 46. Plowr. Ured. 



p. 222. Fischer, Ured. Schweiz, p. 414, f. 288. Sacc. Syll. vii. 



744. Sydow, Monogr. iii. 10"). 

 P. Potentillae-canadeasis Dietel in Hedwig. Beibl. xlii. 179. Sydow, 



Monogr. iii. 106, f. 48. 

 Kuehneola Tormentillae Arthur, Res. Sci. Congr. Vienn. p. 342 (1904). 

 K. obtusa Arthur, N. Amer. Fl. vii. 185 Q912). 



