OX GRAMINE.tt 



271 



Fig. '206. P. perplexans. 

 Teleutospores. 



Uredospores. Sori amphigenous, scattered, roundish, ob- 

 long or linear, occasionally con- 

 fluent, minute, yellow-brown; 



spores globose to ovate, faintly 

 echinulate, yellow, 20 — 28 ja 

 diam. (with 4 — 6 scattered 

 germ-pores on one face, McAl- 

 pine). 



Teleutospores. Sori amphi- 

 genous, scattered, occasionally 

 confluent, minute, generally 

 oblong or linear, about 1 — 1|- 

 mm. long, always covered by 

 the epidermis, black ; spores variable, generally oblong to 

 clavate, rounded, truncate or obliquely attenuated at the apex, 

 slightly thickened (3 /i) and darker, gently constricted, narrowed 

 below, smooth, brown, 36 — 57 x 18 — 24^, with a very short 

 pedicel. 



iEcidia on leaves and petioles of Ranunculus acris ; uredo- 

 and teleutospores on Alopecurus pratensis. Very uncommon. 

 (Fig. 206.) 



The connection of the secidium with the Puccinia was first demon- 

 strated by Plowright, and has since been confirmed by Dietel and by 

 Klebahn. All the teleutospores I have seen were full of a very coarsely 

 granular protoplasm. It must not be forgotten that an secidium on 

 Ranunculus acris belongs also to Uromj/ces Dactylidis. 



Distribution : Holland, Germany and Australia. 



126. Puccinia Magnusiana Korn. 



u'Ecidium Ranunculacearum DC. ; Cooke, Handb. p. 539 ; Micr. Fung. 



p. 196 p.p. 

 Puccinia graminis var. Arundinis Cooke, Handb. p. 493 ; Micr. Fung. 



p. 202. 

 P. Magnusiana Korn. in Hedwig. 1876, p. 179. Phill. and Plowr. in 



Grevillea, xiii. 53. Plowr. Ured. p. 177; Proc. Roy. Soc. Lond. 



xxxvi. 47; Quart. Journ. Micr. Sci. xxv. 156. Sacc. Syll. vii. 631. 



Sydow, Monogr. i. 785. Fischer, Ured. Schweiz, p. 241, f. 189. 



McAlpine, Rusts of Australia, p. 125, f. 18. 



