APPENDIX 



HEMILEIA Berk, et Broome. 



vEcidia, if any, unknown. Uredospores borne singly on 

 hyphae which protrude in fascicles through a stoma. Teleuto- 

 spores formed later on pedicels in the centre of the same 

 fascicles, one-celled, with apical germ-pore, germinating as in 

 Uromyces. 



The character given for Hemileia, when only H. vastatrix 

 was known, of having one side of the uredospore smooth, is now 

 known to be not of universal application. 



Hemileia americana Mass. 



Hemileia amerieuna Mass. in Gard. Chron. 1905, xxxviii. 153, f. 53; 

 Kew Bulletin, 1906, p. 40, with plate. 



Uredospores. Sori hypophyllous, forming broadly effused 

 pulverulent deep-orange patches, 

 often several centimetres in ex- 

 tent ; spores perfectly spherical, 

 shortly stipitate, 24 — 32/x diam.; 

 epispore bearing small, rather 

 sparsely scattered, round warts, 

 and with two germ-pores. 



Teleutospores. Occupying the 

 centres of the heads of uredo- 

 spores, shortly stipitate, colour- 

 less, broadly obovate or turbinate, 

 often with a small obtuse api- Fig 285- /; ameri cana. Tip of 

 cuius, densely verruculose, 30 x CaMZeyaleaf, showing sori (slightly 



J reduced); a, uredospore, and b, 



22 — 25 \x. teleutospore, x (iOO. 



