224 A Monograp]( of the Myxogastres. 



becomes hrokcii wp into large, irregular, persistent patches ; mass 

 of spores brownish-black ; stem ivJdte, equal in length to spo- 

 rangium or much shorter, slightly rugulose ; eolumella ivhite or 

 dirty ochraccous, large, suhglohose ; threads of capillitium pale 

 or colourless, about equal throughout their length, 2 — 3 /x thick, 

 branching at acute angles and connected laterally, forming a 

 net, sometimes flexuous ; spores globose, dingy violet, minutely 

 verrucose, 8 — 11 /x diameter. 



Diclymium hypnophilum, Mass., Journ. R. Micr. Soc, v., 5. 

 p. 757. 



Didymium ncglectum. Berk., hiun. Soc. Journ., v., 14, p. 83; 

 Sacc, 1325. 



a. genuinum. Sporangia stipitate, stem elongated or short, 

 and almost lost in the umbilicus of the sporangium. 



^. scssilis. Sporangia sessile, distinct, or sometimes several 

 confluent, when tlie columella becomes elongated. 



Didymium squamulosum, var. genuinum,, Rost., Mon., p. 159, 

 f. 148; Cooke, Myx. Brit., p. 33, f. 148; Schroeter, p. 122; 

 Raunk., p. 88; Sacc, SylL, 1301. 



Exsicc.—^y±, Myc. March., 1387, 1388; Cke., Fung. Brit., 

 Ed. II., 613; Rab., Fung. Eur., 813; Rab.-Wint., Fung. Eur., 

 2969; Roum., Fung. Gall, 1212; Fuckel, Fung. Rhen., 2497; 

 Syd., Myc. March., 396 (as Didymium farinaeeuni) \ and 492 (as 

 Didymi^im herlarum, Fr.); Ellis, N. Amer. Fung., 1216 ; Roum., 

 Fung. Gall., 1684 (as Didymium farinaeeum) ; Klotzsch (Rab.), 

 Herb, Myc, 455 (as Didymium liemisphericum). 



On rotten wood, leaves, moss, &c. 



About 1 mm. high, distinguished by the calcareous crust of 

 the sporangium becoming broken up into large irregular patches, 

 separated from each other by the blackish inner layer and the 

 pale columella. Most closely allied to Didymium virgineum. 

 For distinctive characters see under the latter. 



Britain (Kew, Wothorpe, King's Cliffe, Norwich, Scarboro', 

 Carlisle, Glamis, Appin, N. B.) ; France ; Italy ; Germany ; 

 Switzerland ; Belgium ; U. States ; Cuba ; Ceylon ; Australia ; 

 Tasmania; New Zealand. 



