224 A Monograph of the Myxogastres. 



becomes broken up into large, irregular, persistent patches ; mass 

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

 rangium or much shorter, slightly rugulose ; columclla white or 

 dirty ochraceous, large, subglobose ; threads of capillitium pale 

 or colourless, about equal throughout their length, 2 3 f* thick, 

 branching at acute angles and connected laterally, forming a 

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

 verrucose, 8 11 /x diameter. 



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

 p. 7571 



Didymium ncglectum, Berk., Linn. 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. 



/3. scssilis. Sporangia sessile, distinct, or sometimes several 

 confluent, when the columella becomes elongated. 



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

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

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



Exq&. Syd., 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 farinaceuni) ; and 492 (as 

 Didymium lierbarum, Fr.) ; Ellis, N. Amer. Fung., 1216 ; Roum., 

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

 Herb. Myc., 455 (as Didymium hemisphericum). 



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. 



