4 14 B ay liss- Elliott and Grove. — Roesleria pallida , Sacc. 
Karst., seems to be nothing but another form of R. pallida, judging from its 
description. These are, however, merely suggestions of probabilities. 
In choosing between Pilacre and Roesleria as a name for the asco- 
phorous genus, it is reasonable to hold that so long as the first described 
species of the former genus, P. Weinmanm (Fr. Syst. Myc., 1829, iii. 204) 
remains unidentified, it is better to retain that generic name for the conidio- 
phorous Fungi such as P. Weinmanni appears to be, and use Roesleria 
(Thiim. and Pass., 1877) for the ascophore, while Coniocybe should be 
reserved for the lichenologists. Should it, however, be finally proved that 
Pilacre and Roesleria are stages of the same fungus, the former name being 
the earlier would perhaps be chosen. The name Ecchyna of Fries (Summa, 
1849, p. 446, note) and Patouillard becomes then superfluous. 
In conclusion, we wish to tender our thanks to the authorities at Kew, 
to Professor G. S. West, and to Mr. J. Ramsbottom of the British Museum, 
for assistance in this investigation. 
Summary. 
1. Roesleria pilacriformis , Henn. is only a slender form of R. pallida , 
Sacc. 
2. Pilacre Peter sii is identical in every respect with P. faginea. 
3. Both species of Pilacre are not basidiophorous, but purely conidio- 
phorous Fungi, and have not the remotest connexion with the Auricularieae 
and the Tremellineae. 
4. Pilacre is probably a conidial stage of species of Roesleria. 
The Botanical Laboratory, 
Birmingham University. 
