ON GRAMINEE 285 
spores subglobose or ellipsoid, verruculose, yellowish, 19—82 x 
16—24 u.] 
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 19—26 yw, with numerous germ-pores, and mixed with nume- 
rous capitate paraphyses which are 10—14, broad and as 
much as 80 uw long. 
| a | c y 
Fig. 215. P. drrhenatheri. a, teleutospores on drrhenatherum, from Hampton- 
in-Arden ; b, another, and ¢, two abnormal ones, from Lichfield; d, a 
paraphysis and uredospore from the latter. 
Np 
Teleutospores. Sori hypophyllous, scattered, minute, puncti- 
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—10 yw) and darker, hardly \°/ 
or not at all constricted, gen- : 7 
erally attenuated downwards, _. 
1h ~ Fig. 216. P. dArrhenatheri. Teleuto- 
smooth, pale-brown, 380—45 spores, paraphysis and uredospore,, 
x 18—24y, mixed with brown- oa Mama Silesia (ex herb. 
‘ 2 ydow). 
ish paraphyses; pedicels short, 
brownish. 
[Aicidia 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 . Magelhaenicum Berk. The ecidium has not been seen in Britain, 
