248 THE MYXOMYCETES 



c. Capillitium attached only to lower part of sporangium, 



branching and anastomosing to form a dense net 3. Lamprodermopsis 



c. Capillitial threads nearly straight, simple or scantily 



forked, attached to base and to sporangial wall 4. Dianema 



1. Listerella John 



Ber. Deutsch. Bot. Ges. 24 : 540. 1906. 



Sporangia sessile, with lobate dehiscence; capillitium of jointed 

 threads attached to the sporangial wall; spores dark. 

 A single species: 



Listerella paradoxa John 



Ber. Deutsch. Bot. Ges. 24 : 540. 1906. 

 PL XVI, Figs. 412, 413, 414. 



Sporangia sessile, pulvinate, 0.1-0.3 mm. in diameter, dull blackish 

 brown, the wall granular except for the lines of dehiscence; capillitium 

 scanty, of slender brownish, jointed threads 1-1.5 n in diameter, 

 attached to the sporangium wall; spores blackish brown in mass, pale 

 brownish gray under the lens, with a distinct germinal region, faintly 

 spinulose or nearly smooth, 7-8 fx. 



A curious form of uncertain position, in appearance and spores sug- 

 gesting Licea, but with an unique capillitium. The capillitial threads 

 are jointed except near the points of attachment, the smaller end of 

 each conical joint inserted in the larger end of the adjoining one, sug- 

 gesting more than anything else the antennae of certain insects. 



On Cladonia. Germany, Russia. 



2. Margarita List. 

 Mycetozoa 203. 1894. 



Sporangia sessile, sometimes plasmodiocarpous; sporangium wall 

 translucent ; capillitium of simple or sparsely branched, hair-like, solid 

 threads with occasional attachments to the sporangium wall. 



A single species: 



Margarita metallica (Berk. &* Br.) List. 



Mycetozoa 203. 1894. 

 PL XVI, Figs. 415, 416. 



1838. Physarum metallicum Berk. & Br., Mag. Zool. and Bot. 1 : 49. 



1876. Cornuvia metallica (Berk. & Br.) Rost., Mon. App. 35. 



1910. Margarita pictoviana Moore, Proc. Nova Scotia Inst. Sc. 12 : 96. 



Sporangia scattered or clustered, sessile, globose, flattened or plas- 

 modiocarpous, 0.5-1 mm. in diameter, coppery iridescent; peridium 



