ON GRAMINE 283 
Uredospores. Sori minute, roundish or elongated, orange, 
on yellowish spots; spores more or 
less globose, minutely echinulate, 
yellow, 25—80 p. ( 7 
Teleutospores. Sori hypophyl- 
lous, minute, ovate, oblong or 
linear, black, long covered by the 
epidermis; spores clavate-oblong 
or irregular, rounded, truncate 
or obliquely attenuate above, 
slightly thickened (4—7 1), more 
or less constricted, rounded or 
often tapering below, smooth, 
brown, 50—60 x 15—-20 uw; pedicels short, hyaline, persistent. 
Fig. 214. P. persistens. 
Teleutospores. 
cidia on Thalictrum flavum, T. minus, May—July ; uredo- 
and teleutospores on Agropyron repens, from July onwards. 
(Fig. 214.) 
The connection of these spore-forms was ascertained by Plowright and 
confirmed by Rostrup. The secidia on various other species of Thalictrum 
may belong to the same Puccinia or to Puccinias on Agropyron caninum, 
Arrhenatherum elatius or even on species of Poa. There is abundant scope 
here for further investigation. According to Fischer the teleuto-sori 
are subdivided into compartments by groups of paraphyses, in the 
same way as in P. Agropyrt. In fact the three species, P. persistens, 
P. Agropyrt, and P. Actaeae-Agropyri Fischer, form a natural group 
which should be regarded rather as biological races of one species, having ' 
their teleutospores on Triticum (Agropyron) and their ecidia on 
Thulictrum, Clematis and Actaea respectively ; the latter (P. Actaeae- 
Agropyrt) has not yet been found in Britain. 
DistTRIBUTION: Europe, Siberia, Japan, Himalaya, North 
America. 
The evidence for considering the three following species as 
British is not yet sufficient :— 
135. Puccinia Phlei-pratensis Erikss. et Henn. 
Puccinia Phlei-pratensis Erikss. et Henn., in Zeitschr. fiir Pflanzenkr. 
1894, p. 140; Getreideroste, pl. 5, f. 55—6. Sacc. Syll. xi. 204, 
Sydow, Monogr. i. 784. Fischer, Ured. Schweiz, p. 260. 
