SYNOPSIS OF MYCETOZOA 179 



Sporangia convolute ; inner sporangium-walls reduced to broad 

 bands 33. Enteridium. 



Sporangia convolute ; inner sporangium-walls laciniate 



34. Reticularia. 



Order V. — Lycogalaceje. Sporangia forming an sethalium ; 

 pseudo-capillitium consisting of branched colourless 

 tubes • . . • . 35. Lycogala. 



Subcohort II. — Calonemines:. Capillitium present as a system 

 of uniform or sculptured threads. 



Order I. — Tkichiace^. Capillitium consisting of free tubu- 

 lar threads (" elaters"), or a network branching at wide 

 angles, with thickenings in the form of spirals or rings. 



Elaters free, spirals distinct 36. Trichia. 



Threads free, scanty, spirals obscure . . .37. Oligonema. 



Capillitium combined into a network of threads with distinct 

 spiral thickenings 38. Hemitrichia. 



Capillitium a network with thickenings in the form of rings 



39. Cornuvia. 



Order II. — ARCYRiACEiE. Capillitium a network of tubular 

 threads branching at wide angles and thickened with 

 cogs, half-rings, spines, or warts (usually scanty and of 

 free threads in Perichana populina). 

 A. Capillitium elastic : — 



Sporangia stalked ; sporangium-walls evanescent above 



B. Capillitium not elastic : 



40. Arcyria. 



Sporangia sessile or shortly stalked, clustered, the walls single, 

 persistent 41. Lachnobolus. 



Sporangia sessile, rarely stalked, the wall usually double, per- 

 sistent • .... 42. Perichaena. 



* 



Order III. — MARGARiTACEiE. Capillitium of solid threads 

 coiled and hair-like, or straight and attached to the 

 ' sporangium-wall, simple or branching at acute angles. 



A. Sporangia dehiscing irregularly : — 



Threads profuse, coiled ........ 43. Margarita. 



Threads straight 44. Dianema. 



Threads penicillate, spirally banded ... 45. Prototrichia. 



B. Sporangia dehiscing in lobes : — 



Threads with moniliform thickenings ... 46. Listerella. 



Subclass I.— EXOSPOEE^E. 



Order I. — Ceratiomyxace^. 



1. Ceratiomyxa Schroeter. Surface of sporophores mapped out 

 into polyhedral areolae, from the centre of each of which arises 

 a slender stalk bearing a single ellipsoid spore 



C. mucida Schroeter. 



