266 PUCCINIA 
on A. flecuosa have no paraphyses, as those on A. caespitosa 
have, but otherwise they are almost identical and are undoubt- 
edly P. dispersa (sens. lat.). I find similar spores on A. caes- 
pitosa round Birmingham, and have a specimen on the same 
host sent by the late H. T. Soppitt from Saltaire; this latter 
is the plant referred to in a note to P. Bary: (Plowr. Ured. 
p. 192)—both these have abundant paraphyses with the uredo- 
spores. Herr H. Sydow informs me that he considers the 
presence or absence of these paraphyses to be a character of 
little importance in P. dispersa. It must be remembered that 
P. graminis also grows on A. caespitosa, but the uredospores 
can be easily distinguished by their elliptical shape and three 
or four subequatorial yerm-pores ; their membrane is brownish, 
but without the chocolate tinge of P. dispersa. 
123. Puccinia sessilis Schneid, 
Puccinia sessilis Schneid. in Schrot. Brandpilze Schles. p. 19. 
P. linearis Rob. ; Cooke, Mier. Fung. p. 203. 
cidiospores. See the descriptions given for the four 
specialised biological races. 
Uredospores. Sori amphigenous, scattered, minute, puncti- 
form or shortly linear, yellow; spores globose to ellipsoid, 
echinulate, brownish-yellow, 20 
: —28 x 18—24 y; epispore thin, 
( ) with about seven germ-pores. 
Teleutospores. Sori similar, 
(_) sometimes confluent, long cov- 
ered by the epidermis, pul- 
vinate, black; spores oblong 
Fig. 2038. P._ sessilis. or oblong-clavate, rounded or 
Teleutospores and mesospore. 
truncate above where they are 
darker and slightly thickened (2—5), hardly constricted, 
somewhat narrowed below, smooth, brown, 35—52 x 15—22 py; 
pedicels very short or absent ; an occasional mesospore is found, 
Aicidia on various species of Monocotyledons; uredo- and 
teleutospores on Phalaris (Digraphis) arundinacea, uncommon, 
July—May. (Fig. 203.) 
