The paraphyses or cysts forming the outermost and basal 
portion of the head of spores are very variable in number and 
size, but can always be found, even when all the spores are 
mature; whereas in U. vastntri.r, bodies similar in appearance, 
and occupying a like position, are present when the head is 
forming, but eventually develop into normal spores. 
Hemileia americana, Massee. G-ard. Chron., 1905, p. 153, fig. 53. 
I. Unknown. 
II. Hypophylloue; forming broadly effused pulverulent, deep 
orange-coloured patches, often several centimetres in extent; 
spores shortly stipirate, perfectly spherical: epispore bearing 
small, rather sparsely scattered, muml warts, 24 — H2 /< diameter; 
germ-pores two; germ-tubes cylindrical, bearing a few short 
branches. 
III. The teieutospores occupy the central portion of the heads 
ot ".''^"spores, shortly stipirate, colourless, broadly obovate or 
turbinate, often with a small, obtuse, apical umbo; episnoro 
closely covered with minute warts, avrra-in- 3<> x 2."> ,;. 
Costa Rica. On living leaves of Gatthya dowiana, Batem. 
Only a^small patch of rust was present on one leaf when the 
ncreas< 
The spores germinate readily, usually within 24 hours in various 
rhapa best in a very dilute decoction of 
■nons of the germ-tube, so characi 
1 ■ ' '1*1' It ' i i . Ji:i\ r ""*■ u - 1 -- 
13 days after inoculation. Hitherto 
success has attended the 
attempt to inoculate orchids belonging to othei 
ablest myCeliUm iS ^ abundant in ^ tissues; haustoria are 
Hemileia indica, Massee. 
I. Unknown. 
longer than the diameter of the fpofe, 10 « thfck V.ttf 
hyaline ; germination unknown. ^ ' ^ se P tat Q 
