:*N2 



1 1 KM 1 1. HI A 



( >n leaves of Cattlei/a Duiciunn I Ijit < -in., imported from 

 Costa Rica, L899. (Fig. 285.) 



Only a small patch of IJust was present mi the leaf when the plant 

 was received from Costa Rica, but this continued to increase in size and 

 the tailing spores infected other leaves. The uredospores germinated 

 readily, and young Cattleya leaves, inoculated on the under .surface, 

 produced mature uredospores in thirteen days. No success attended the 

 efforts to infect oilier orchids, not belonging to the genus Cattleya. 



This description is founded on that given in the Kew Bulletin; on 

 referring to the Gardener's ( Ihronicle (I.e.) it will be seen that the 

 particulars there given differ in several respects. The specimen is in the 

 Kew Herbarium. This fungus and the others of the same genus might 

 easily become dangerous parasites in orchid houses, if allowed to spread; 

 though it seems probable, on the slender evidence at present known, that 

 each is confined, like most other Rusts, to a single genus, if not species. 



Hemileia Phaji Sydow. 



Credo I'lit'ji Haciborski, Parasit. Alg. und Pilz. 1900, ii. 32. 

 U. Lynchii Adams, Irish Naturalist, 1911, xx. 68. 

 Hemileia Phaji Sydow, Monogr. iii. (ined.). Grove, Journ. Bot. 1913. 

 p. 44. 



Y,j. 286. H. Phaji. a, epidermis, showing fascicle of uredospores emerging 

 from a stoma, x 180 ; b, the same in section ; c, uredospores, x 600 ; d, a 

 portion of a leaf, with uredo-sori, in Herb. Kew, x ^. 



Uredospores. Sori hypophyllous, densely scattered, round, 

 distinct, formed of little dense fascicles of hyphae (20—25) 

 which issue through a stoma; pedicels divergent, clavate up- 

 wards, each surmounted by a spore ; spores subglobose or rarely 



