Lejndodannfi. 251 



Didymium connatum, Peck. 



Peridium depressed or subglobose, cinereous, furfuraceous, 

 stipitate; stems mostly connate at the base, tapering upward, 

 lono-itudinally wrinkled, whitish or cream-colour; spores sub- 

 olobose, black, -OOO-i in. in diameter. 



Didymium cotmatiom, Peck, 26th Report, N. Y. State Mus., 

 p. 74. 



Fhysarnm polymoiyhum, Sacc, Syll., vii., 1, n. 1196. 



Decaying fungi. Portville, U. States. 



The subfasciculate mode of growth is characteristic of this 

 species. (Peck.) 



Unknown to me. In Saccardo's Sylloge the present species 

 is oiven as a synonym of Physarwn polymorphum, but the 

 description above does not justify this, and it is very doubtful 

 whether the type specimen has been examined by Berlese. 



Didymium flavidum, Peck. 



Peridium subglobose, sessile, thin, yellow, clothed with a 

 minute yellow mealiness ; spores subglobose, black, "0004' in 

 diameter. 



Didymium flavidum, Peck, 28th Report, N. York State Mus., 

 p. 54. 



Physarum Jlavidum, Berlese, Sacc, Syll., vii., 1, n. 1215. 



Bark of dead balsam trees, Abies halsamca. North Elba; U. 

 States. 



Lepidoderma, De Bary, 



Sporangia sessile or stipitate or a plasmodiocarp, wall fur- 

 nished externally with large scales consisting of bicarbonate of 

 lime, superficial or enclosed in lenticular cavities of the mem- 

 brane ; columella generally present. 



Rost., Mon., p. 187; Cooke, Myx. Brit., p. 43; Sacc, SyU., 

 vol. vii., p. 386. 



Closely related to Didymium, and differing only in the fact 

 that the external coating of lime is broken up into large, per- 

 sistent patches, instead of forming a pruinose coating consisting 



