Heteropiiccinia. 1 79 



Puccinia molinise. Tul. 



^cidiospores — Pseudoperidia on round discoloured spots, flat, 

 with torn, white edges. Spores subglobose, finely verrucose, 

 orange-yellow, 17-25 x 15-21/x. 



Uredospons — Sori chestuut-brown, elliptical or linear, often con- 

 fluent. Spores globose or shortly elliptical, very thickly but 

 finely echinulate, yellowish brown, 24-28/x, in diameter. 



Teleutospores — Sori black-brown, elliptical or linear, pulvinate, 

 naked, often confluent. Spores elliptical, central constriction, 

 slight, base rounded, apex rounded, much thickened, smooth, 

 brown, 30-56 X 20-26/^. Pedicels brownish, permanent, very 

 long (loo/x). 



Synonyms. 



Puccinia molinice. Tul., Mem. Ured. Ann. Sc. Nat., series iv., 

 vol. ii. p. 141. Winter in Rabh., " Krypt. Flor.," vol. i. p. 219. 

 Cooke, " Micro. Fungi," 4th edit., p. 203. 



JEcidium orchidearum, Field. Cooke, " Hdbk.," p. 545 ; 

 " Micro. Fungi," 4th edit., p. 200. 



Exsiccati. 



Cooke, i. 106. Vize, " Micro. Fungi Brit," 558 (?). 



yEcidiospores on Orchis latifolia, May and June. 

 Uredospores and teletitospores on Molinia ccerulea, July to 

 October. 



Biology. — The life-history was worked out by Rostrup, and 

 while there is no reason to doubt the accuracy of his conclusions, yet 

 I was unable to produce the uredospores on M. ccerulea from the 

 iecidiospores on O. latifolia from Irstead. Neither have I been able 

 to find P. molinia at Irstead, although the^cidium is abundant there 

 during May and June on O. latifolia. It is therefore probable that 

 two species have their aecidiospores on O. latifolia. 



Puccinia perplexans. Plow. 



yEcidiospores — Pseudoperidia in roundish or elongate clusters on 

 thickened yellow, often concave spots, shortly cylindrical, with 

 torn white everted edges. Spores subglobose or polygonal, 

 finely echinulate, orange-yellow, 24-28 X 20-25/A. 



