Didymium. 249 



Didymium versipelle, Fr. 



Sporangia lenticular, umbilicate below, at first white, pruinose, 

 becoming polished, chestnut, stem conical, rugose, pallid fulvous ; 

 columella brown ; spores smoky-black. 



Didymium vcrsixidle, Fr., Syst. Myc, iii., p. 117; Sacc, 1830. 



Sweden. 



Stem about 2 mm. long, conical, wrinkled, sporangium de- 

 pressed, umbilicate, wall thin, whitish-pruinose, then naked and 

 shining, chestnut, dehiscing by a longitudinal fissure like a 

 bivalve ; columella large, globose, brown. (Fr.) 



Didymium Fairmani, Sacc. 



Sporangia scattered, sessile, with stellate crystals; columella 

 subglobose, brownish ; threads of capillitium hyaline, forming a 

 loose reticulation ; spores smooth, 8 — 10 /x. 



Didymium Fairmani, Sacc, Journ. Myc, vol. v., p. 180 ; I.e., 

 vol. v., p. 78. 



On leaves of Smilacina hifolia. Syndonville, Orleans County, 

 N. Y. 



The diagnosis is altogether inadequate, and it is much to be 

 regretted that the seventeenth century style of description 

 should be resuscitated at the present day. Professor Saccardo's 

 description is thoroughly bad, inasmuch as it does not describe 

 anything. 



Didymium erythrinum, Berk. 



Stem equal, vermilion, as is the globose sporangium, spores 

 black, flocci Avhite. 



Berk., Grev., vol. ii., p. 52 ; Sacc, Syll., 1322. 



The pulverulent matter with which the peridium is clothed 

 soon rubs off. 



As there is no specimen of the above species in Berkeley's 

 Herbarium, I am unable to add to the above meagre description. 



Didymium angulatum, Peck. 

 Sporangia delicate, subglobose, whitish, externally mealy 

 with numerous granules and crystals of lime; stem short. 



