284 puccinia 



/ redospores. Sori on the leaves or most often on the 

 culms, on the latter and on the sheaths continent in long lines 

 (as much as 3 cm. long) and splitting the epidermis, on the 

 leaves more often scattered, minute and oblong, 1 — 2 mm. long, 

 pulverulent, dart yellowish-brown; spores ellipsoid to oblong 

 or even somewhat pear-shaped, aculeate, dirty-yellow, 18 — 30 x 

 15 20 p. 



Teleutospores. Sori similar, but chiefly on the culms, black- 

 brown ; spores clavate, rounded or conically attenuate above, 

 thickened (up to 8/x), constricted, attenuated below, smooth. 

 brown, 38 — 52 x 14 — 20 fi; pedicels brownish, persistent, rather 

 thick, as much as 60 /x long. 



On leaves and culms of Phleum pratense (and P. nodosum)-, 

 also on Festuca elatior. 



This was separated by the authors from P. graminis on the ground 

 that it will not infect Berberis ; Eriksson has shewn that it will feebly 

 infect Phleum Michelii, Secale cereale, and Avena sativa, but not Triticum 

 vulgare, Hordeum vulgare or Poa pratensis. It chiefly occurs in the uredo- 



stage, and winters thereby or by its mycelium ; in many localities the 

 teleutospores are not formed at all. This may be one of the cases where 

 the secidium has been dropped completely from the life-cycle. I have not 

 seen a British specimen, but it is extremely likely to occur here. 



Distribution: Germany, Austria, Denmark. Sweden. 



130. Puccinia Arrhenatheri Erikss. 



jEcidium graveolens Shuttl. apud Cooke, in Bull. Sec. Bot. Fr. 1877, 



xxiv. 315. Sacc. Syll. vii. 77 s . 

 Puccinia perplexans Plowr. f. Arrhenatheri Kleb. in Abhandl. Natur. 



Ver. Bremen, 1893, p. 366. 

 P. Arrhenatheri Erikss. in (Vim's Beitrage zurBiologie d. Pflanz. 1898, 



viii. 1. Sydow, Monogr. i. 739. Fischer, Ured. Schweiz, p. 345. 



[Spermogones. Very numerous, minute, covering a great 

 part of the leaf or the whole leaf uniformly. 



JEcidiospores. zEcidia hypophyllous, sometimes even on 

 the flowers, deforming the affected branches, generally distri- 

 buted densely and evenly over the whole leaf, between cylin- 

 drical and cup-shaped, with a torn whitish revolute margin ; 



