314-xxI1 SOCIÉTÉ BOTANIQUE DE FRANCE. 
Peziza scutellata. | Peziza hyalina. 
— nivea. | Puccinia Glechomæ. 
— cinerea. (— Rhinanthi. 
— firma. Coleosporium Rhinanthacearum. 
— (Gouani. | 
A la suite de cette communication, M. Roze fait part à la Société 
des craintes éprouvées par la Commission d'organisation au sujet du 
peu d'importance des résultats que paraissent. devoir. présenter les 
excursions annoncées par le programme de la Session comme 
devant étre faites, le mercredi 24 octobre et le jeudi 25, dans les 
bois de Meudon et d'Ecouen. A la demande de plusieurs personnes, 
il propose à la Société de modifier le programme de la facon sui- 
vante : 
Mercredi 24 octobre. — Repos et visite dans l'après-midi aux collec- 
tions paléontologiques et mycologiques du Muséum d'histoire naturelle. 
Jeudi 25 octobre. — Excursion dans la forét de Montmorency, sous 
la direction de M. Boudier : cette excursion sera particulièrement con- 
sacrée à la récolte des Tubéracés. 
Aprés une courte discussion, cette proposition est adoptée. 
M. Cooke fait à la Société la communication suivante : 
SOME ALLIED SPECIES OF JECIDIACEI, by M. €. COOKE. 
| desire to direct attention to two or three instances, out of a great 
many whieh have comeunder my notice, in which two very similar Fungi 
have been confounded together under the same specific name, or at least 
are so similar in many of their features as to be in danger of being mis- 
taken the one for the other. The examples which I shall select are from 
the parasitic Coniomyceles, but il is not my intention to enter at all upon 
the question of the autonomy of these plants, on this occasion, as that 
would open a wide field for discussion. Suffice it to say that I am strongly 
of opinion that too much has been taken for granted, which should have 
been proved, and that many a pretty theory of dimorphism has no solid 
foundation, such as science has a right to demand. 
The lirst example relates to the genus Peridermium, of which Perider- 
mium Pini is well known. Here however we have two forms, as intimated 
long ago by Link, the one on the twigs, the other on the leaves. Fuckel 
divided them as two distinct species under the names of P. Pini, and 
P. oblongisporum. Y shall now aliude to them under the names proposed 
by Link, for the varieties, as P. corticolum and P. acicolum. There was 
no reason for Fuckel to invent a new name. 
