MARGARITACEAE 



255 



KEY TO THE GENERA OF MARGARITACEAE. 



A. Sporangia dehiscing irregularly : — 



Capillitium threads profuse, coiled. (46) Margarita. 



Fig. 53. — Margarita metallica Lister. 



a. Two sporangia. Magnified 6 times. 



6. Part of a long capillitium thread, and a spore. 



Magnified 250 times. 



Fig. 53. 



Capillitium of nearly straight slender threads attached above 

 and below to the sporangium- wall. (47) Dianema. 



Fig. 54. — Dianema depression Lister. 



a. Plasmodiocarp. Magnified twice. 



ft. CaDillitium attached above and below to the walls 



of the sporangium. Magnified 50 times. 

 c. Spore. Magnified 560 times. 



Fig. 54. 



Capillitium threads marked with spiral thickenings, stout 

 below, penicillate and slender above, attached above and 

 below to the sporangium- wall. (48) Prototrichia. 



Fig. 55. — Prototrichia metallica Mass. 



a. Group of sporangia. Magnified 4 times. 



ft. Capillitium attached above to a fragment of 

 the sporangium-wall, and a spore. Mag- 

 nified 280 times. 



Fig. 55. 



B. Sporangia dehiscing in lobes ; capillitium threads with 

 moniliform thickenings. (49) Listerella. 



Fig. 56. — Listerella paradoxa J aim. 



a. Sporangia. Magnified 50 times. 



6. Capillitium thread and spores. Magnified 460 times. 



