40 BRITISH DISCOMYCETES. 
Genus X.—Raurzina. Fries. 
Sessile, effused like a crust, afterwards bullato-inflated, 
determinate, hymenium occupying the upper surface; 
under side furnished with root-like fibrils; flesh firm, 
persistent ; asci cylindrical; sporidia 8, large. (Plate IT. 
fig. 10. 
On the earth or on wood. 
Large (from 1 to 3 inches), persistent. 
Name—piZa, a root; from the root-like fibrils which 
clothe more or less of the under surface, attaching it to 
the ground. 
1. Rhizina undulata. Fries. 
Effused, undulate, bay-brown; margin inflexed, 
flocculose beneath, and pallid; asci cylindrical; sporidia 
8, fusiform, sub-acute, 2-guttulate, at length pseudo- 
septate, 30—35 X 9u; paraphyses filiform, enlarged and 
brown at the apices, which adhere firmly together: 
(Plate IT. fig. 10.) 
Rhizina undulata—Fries, “Sys. Myco.,” ii. p. 33; 
Scheff, t. 153; Pers., “Myco. Eur,” p. 216; Tul. “ Hyp.,” 
t. 21, f. 16; Curr, “Linn. Trans.,” xxiv. p. 493, t. 51, 
f. 7-9; Fekl, “Symb. Myco.,” p. 332; Cooke, “ Handbk.,” 
No. 1963 ; Gill, “Champ.,” p. 28, c.i.; Pat., p. 209, £ 479. 
Exs.—Rabh., “ Fung. Eur.” Nos. 39 and 725; Phil, 
“Elv. Brit..” No. 56; Cooke, “Fung. Brit.,” ser. ii, No. 
400; Winter, “ Fungi Eur.,” 2750; Rehm., “ Asco.,” 701. 
On gravelly and sandy soil that has recently been 
exposed to fire, 
‘Varying in size from } an inch to 3 inches broad. 
At first orbicular, plane, with a whitish margin; when 
mature convex, undulate, and irregular in outline. The 
rhizinge are coarse fibres occupying the greater part of 
the under surface, but absent for a certain distanee 
from the margin, which is tomentose and rufous; when 
dry the hymenium becomes black and hard. The fusi- 
form sporidia have a thick epispore, especially at the 
extremities, and are faintly coloured. The paraphyses 
