HEMILEIA 383 
obovate, strongly but sparsely echinulate-verrucose all over, 
13—15 mw diam. or 18—25 x 12—16 uw. 
On Phajus Wallichti. Botanic Gardens, Glasnevin, Dublin 
(Sir Frederick Moore). April. (Fig. 286.) . 
The description and figures a, b, and ¢ are derived from some slides 
mounted by Sir Frederick; I have not seen the leaves, which were not 
preserved, but there is an exactly similar form on Phajus sp. in Herb. 
Kew, unlocalised but apparently sent up by some gardener for identifica- 
tion. This also was named Uredo Lynchii at first. 
Hemileia Oncidii Griff. et Maubl. 
Hemileaa Oneidii Griff. et Maubl., Bull. Soc. Myc. Fr. 1909, p. 138, 
pl. vi. 
Uredospores. Sori hypophyllous, numerous, pulverulent, 
orange, minute, 50—100 w diam.; fertile hyphe issuing from 
stomata, fasciculate, branched, 25—30 yu long, clavate above; 
ms 
Fig. 287. H. Oncidii. Uredospores, a, wet, b, dry : c, part of leaf, showing 
uredo-sori, x}. From the specimen in Herb. Kew. 
spores globose or rarely obovate, echinulate-verrucose, filled 
with orange drops, 16—18, diam., occasionally 20 long; 
epispore hyaline. 
[Teleutospores. Sori growing in the centre of the spots, 
pallid-brownish ; spores subglobose or pyriform, at first hyaline, 
aculeate, then pallid-brown and somewhat smooth, 20—23 x 
15—20 p.] 
On Oncidium varicosum, imported by Messrs Stuart Low 
& Co. from San Paulo, Brazil, August, 1909. Specimen in 
Herb. Kew. (Fig. 287.) 
In the Kew specimen, the spots occupied by the crowded groups 
of uredo-sori are more or less oval, $—1 cm. across, and covered with 
orange-yellow dust, but as the sori are limited, each by the stoma 
through which it issues, they never become confluent. The description is 
founded upon that of Griffon and Maublanc; only uredospores were seen. 
What is doubtless the same species has been found at the Botanic 
