188 THE MYXOMYCETES 



reflections; peridium membranous, transparent, free from the capil- 

 litium as in Lamproderma; columella completely lacking; capil- 

 litium arising from the base of the sporangium, the filaments almost 

 colorless, anastomosing, especially toward their outer ends, and fre- 

 quently with triangular enlargements at the junctions; spore-mass 

 bluish black; spores blackish purple, covered with cylindrical papil- 

 lae 1 jii in length, 12-14 /jl in diameter. 

 Swiss Alps. 



2. Enerthenema Bowman 



Trans. Linn. Soc. 16 : 152. 1828. 



Sporangia stipitate, the stipe extended as a columella, which en- 

 tirely tranverses the sporangium and forms at the apex an expanded 

 disk; from this depends the capillitium. 



KEY TO THE SPECKS OF ENERTHENEMA 



a. Color fuscous to violaceous or ferruginous; spores mi- 

 nutely warted, not clustered I.E. papillatum 



a. Color black; spores rough b 



b. Spores not clustered, dark, coarsely verrucose 2. E. melanospermum 



b. Spores clustered; exposed area long-spinescent 3. E. berkeleyanum 



1. Enerthenema papillatum (Pers.) Rost. 



Mon. App. 28. 1876. 



(as £. papillata) 



PI. XIII, Figs. 305, 306. 



1801. Stemonitis papillata Pers., Syn. Meth. Fung. 188. 



1828. Enerthenema elegans Bowman, Trans. Linn. Soc. 16 : 152. 



1888. AncyropJwrus crassipes Raunk., Bot. Tidsskr. 17 : 93. 



Sporangia fuscous, becoming more or less ferruginous when blown, 

 globose, stipitate, 0.5-0.7 mm. in diameter, 1-1.5 mm. tall, tipped 

 with the small, shining cupulate or rarely papillate apex of the col- 

 umella; stipe black, opaque, attenuate above, about equal to the 

 peridium; the basal portion of the sporangium wall often remaining 

 as a ring around the stem after dehiscence; columella slender, cylin- 

 drical, unbranched, expanding at the apex into a disk from which the 

 capillitial threads arise; these long, slender, sparingly branched, more 

 or less nexuose, dark with free tips ; spores olivaceous fuscous, minutely 

 warted, 10-12 fi. 



The papilla referred to in descriptions, and from which the name is 

 derived, seems to be nothing more than the disk-like top of the cap- 



