208 FUNGUS-FLOKA. 



Approachiug tlie genus Cyathicula in the minutely dentate 

 margin of the ascophore, but differing in the soft, watery 

 substance of the asoophore, and in being sessile. 



** On leaves, Jierhaceous stems, and culms. 



MoUisia atrocinerea. Phil., Brit. Disc, p. 176; 

 Eehra, Krypt.-Mora, Disc, p. 530; Sacc, Syll., n. 1334. 

 (figs. 18-23, p. 15G.) 



Scattered or gregarious, sessile on a broad base, very thin 

 and soft, soon becoming quite plane and Tyith a very narroT\'", 

 slightly raised, dark brown margin, which is often wavy ; 

 excipulum smooth, dark olive brown, parenchymatous, cells 

 olive, irregularly polygonal, 6-9 /x diameter, becoming 

 arranged in parallel, septate series and a little paler at the 

 margin ; disc plane, pale pearly-grey when moist ; up to 

 -J- mm. across ; asci cylindric-clavate, base thickish, 8-spored ; 

 spores biseriate, continuous, smooth, hyaline, straight or 

 slightly curved, cylindrical or with a slight tendency to 

 become clavate or fusiform, 6-8 x l'6-2 jx; paraphyses 

 cylindrical, hyaline, about 2 mm. thick. 



Peziza atrocinerea, Cooke, Brit. Fung., ser. i.. exs., n. 382. 



Peziza atrata, var. polygoni, Cke., Brit. Fung. i. 284. 



On stems of Polygonum (Cooke's type) in Britain. Said to 

 have occurred on Galium, Pumex acetosa, Oenothera biennis, 

 Sium latifolium, Anthriscus sylvestris, Valeriana officinalis, 

 Dipsacus, and Solidago on the continent. 



Type specimen examined. 



The present species appears to be identical with MoUisia 

 iwlygoni, Rehm, Krypt.-Mora, Disc, p. 527. I can find no 

 difference between Eehm, Ascom,, nos. 70 a — c, and Cooke's 

 type specimen. 



MoUisia atrata. Karsten, Myc Fenn., i. p. 200 ; 

 Phil., Brit. Disc, p. 181 ; Eehm, Krypt.-FL, Disc, p. 529. 



Gregarious, sessile, at first globose and closed, then cup- 

 shaped, finally almost plane, about ^ mm. across ; hymen ium 

 whitish or pale-grey, externally glabrous, often more or less 

 distinctly vertically wrinkled, brown with an olive tinge or 

 greyish, margin paler ; excipulum parenchymatous, cells of 

 cortex polygonal or almost circular near the base, 6-8 /x 



