262 British Uredinee and Ustilaginee. 
Uredo orchidis, Mart. Cooke, ‘“Hdbk.,” p. 5273; ‘Micro. 
Fungi,” 4th edit., p. 216. 
Exstccati. 
Cooke, i. 61; ii. 323. 
On Orchis maculata, latifolia, Listera ovata. 
May and June. 
BIOLoGY.—In view of so many statements having been made that 
the Czeomata are the ecidiospores of the Melampsore, I have ‘made 
several cultures with the teleutospores of AZ. betuline on Orchis 
maculata and latifolia, but always without result (Exp. 256, 284, 343). 
I was led to-do so from finding C. orchidis under -a birch-tree affected 
with the Melampsora, but I feel sure there is no connection between 
these two fungi. 
Czxoma, laricis. (Westd.). 
Sori minute, on yellow spots, surrounded by the ruptured epi- 
dermis and a number of barren cells. Spores subglobose or 
elliptical, finely echinulate, orange-yellow, 15-25 X 12-18. 
Synonym. 
Winter, Zoc, ctt., p. 256. 
Uredo laricis. Westd., Bullet, Acad. Roy. Belgique, 2nd séx., 
tome xi., No. 34. 
On Pinus larix. 
May and June. 
B1oLoGy.—This species is not uncommon early in the year on 
larch foliage, but is very inconspicuous and easily overlooked. From 
certain reasons I was led to apply the spores to a plant of Seneczo 
jacobea, but they produced no result. The investment of barren cells 
shows its relationship to the 4Zcidia. Hartig has more recently 
asserted that this species is connected with one form of Jelampsora 
tremula, and Professor Trail has found them growing in company 
near Aberdeen (see p. 241). 
ZECIDIUM. 
Spores surrounded by a pseudoperidium ; produced in basipetal 
series. Germination as in Uredo. 
