APPENDIX 
HEMILEIA Berk. et Broome. 
Ecidia, if any, unknown, Uredospores borne singly on 
hyphe 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 americana 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, 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 apl- Fig. 285. H. americana. Tip of 
culus, densely verruculose, 30 x Cattleya leaf, showing sori (slightly 
reduced); a, uredospore, and b, 
22—25 p. teleutospore, x 600. 
