266 



PU( I l\l \ 



on A. fleccuosa have no paraphyses, as those od A. caespitosa 

 have, but otherwise they are almosl identical and arc undoubt- 

 edly P. dispersa (sens. lat.). I tiixl 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. I'm mi (I'lowr. CJred. 

 ]>. 192) — both these have abundanl 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 ^1. <-<tes]>itosu, but the uredospores 

 cm be easily distinguished by their elliptical shape and three 

 or tour subequatorial germ-pores; their membrane is brownish, 

 but without the chocolate tinge of P. dispersa. 



I "2-'l. Puccinia sessilis Schneid. 



Puccinia sessilis Schneid. in Schrot. Brandpilze Schles. p. 19. 

 P. linearis Rob. ; Cooke, Micr. Fung. p. 203. 



./„'<■ i'/iospores. 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 /J,: epispore thin, 

 with about seven germ-pores. 



Teleutospores. Sori similar, 

 sometimes confluent, long cov- 

 ered by the epidermis, pul- 

 vinate, black ; spores oblong 

 or oblong-clavate, rounded or 

 truncate above where they are 

 darker and slightly thickened (2 — 5 ft), hardly constricted, 

 somewhat narrowed below, smooth, brown, 35 — 52 x 15 — 22 /j.; 

 pedicels very short or absent ; an occasional mesospore is found. 

 JEcidia on various species of Monocotyledons ; uredo- and 

 teleutospores on Pkalaris (Digraphis) arundinacea, uncommon, 

 July— May. (Fig. 203.) 



Fig. 203. P. sessilis. 



Teleutospores and mesospore. 



