ON GRAMIXE.K 



285 



spores subglobose or ellipsoid, verruculose, yellowish, 19 — 32 x 

 16—24^.] 



Uredospores. Sori epiphyllous, very rarely hypophyllous, 

 on minute yellow spots, elliptical or oblong, minute, pale rust- 

 coloured; spores globose to ovate, echinulate, yellowish, 19 — 30 

 x 1!) — 2(3 ft, with numerous germ-pores, and mixed with nume- 

 rous capitate paraphyses which are 10 — 14 fi broad and as 

 much as 80 fx long. 



Fig. 215. P. Arrhenatheri. a, teleutosporea on Arrhenatherum, from Hampton- 

 in-Arden ; b, another, and c, two abnormal ones, from Lichfield ; d, a 

 paraphysis and uredospore from the latter. 



Teleatospores. Sori hypophyllous, scattered, minute 

 form or shortly linear, covered 

 by the epidermis, black; spores 

 ellipsoid -oblong or oblong- 

 clavate, rounded, truncate or 

 rarely gently attenuated a- 

 bove where they are thickened 

 (5 — lOyu.) and darker, hardly 

 or not at all constricted, gen- 

 erally attenuated downwards, 

 smooth, pale-brown, 30 — 45 

 x 18 — 24/x, mixed with brown- 

 ish paraphyses; pedicels short, 

 brownish. 



puncti- 



Fig. 216. P. Arrhenatheri. 

 spores, paraphysis and ur 

 on Arrhenatherum, 



Sydow). 



Silesia 



Teleuto- 

 edospore,. 

 (ex herb. 



[/Ecidia on leaves and flowers of Berberis vulgaris ;] uredo- 

 and teleutospores on Arrhenatherum elatius. (Figs. 215, 216.) 



This .species produces on the Berberis its characteristic witches' -brooms, 

 composed of many upright branches ; it was at first mistakenly identified 

 with jE. Magelkaenicum Berk. The secidium has not been seen in Britain. 



