304 Mycetozoa of North America 



Fig. 4. Diderma floriforme X 9 (p. 105), Ochraceous brown sporangia 

 with large columellae, and on similar colored stalks. 



Fig. 5. Diderma radiatum X 6 (p. 105). Sessile, brownish, mottled 

 sporangia with large columellae. 



Plate 10 



Fig. 1. Didymium Sturgisil X 6 (p. 128). White, thinly effused plas- 

 modiocarps. 



Fig. 2. Didymium crustaceum X 6 (p. 131). White sporangia on pale 

 buff stalks; the outer fragile crust of lime-crystals is shown by two sporangia 

 in the lower right hand corner of the figure. 



Fig. 3. Mucilago spongiosa X 3 (p. 134). An aethalium composed of 

 more or less confluent sporangia, white in color. 



Fig. 4. Lepidoderma tigrinum X 9 (p. 135). Olive-gray sporangia with 

 white, stellate, crystalline plates of lime on the outer surface, and on orange 

 colored stalks. 



Fig. 5. Stemonitis confluens X 9 (p. 147). A small group of black 

 sporangia, nearly sessile, and joined together by lateral extensions of the 

 capillitium; on the extensions are small, black discs, the persistent remains 

 of the otherwise evanescent sporangial walls. 



Pl.\te 11 



Fig. 1. Comatricha elegans X 100 (p. 161). Capillitium free of spores and 

 showing the columella dividing within the sporangium. 



Fig. 2. Comatricha elegans X 100 (p. 161). Capillitium free of spores 

 and showing the columella dividing below the sporangium. 



Fig. 3. Comatricha extendens X 10 (p. 162). A group of purplish brown 

 sporangia on long black stalks. 



Fig. 4. Comatricha extendens X 50 (p. 162). Capillitium free of spores, 

 and showing the absence of a columella. 



Fig. 5. Comatricha Rispaudii X 12 (p. 168). A cluster of brown 

 sporangia free of spores. 



Fig. 6. Comatricha Rispaudii X 9 (p. 168). A cluster of brown sporangia 

 with spores intact. 



Plate 12 



Fig. 1. Comatricha Rispaudii (p. 168). Spores of the species showing 

 reticulation by raised ridges or bands X 450. 



Fig. 2. Lamproderma Gulielmae X 9 (p. 176). Silvery gray sporangia on 

 black stalks; the walls of the sporangia are spotted with black patches. 



Fig. 3. Cribraria argillacca X 6 (p. 189). A group of yellowish brown 

 sporangia on dark brown stalks. 



Fig. 4. Cribraria laxa X 9 (p. 196). A group of yellowish brown sporan- 

 gia on dark brown stalks; always on leaves. 



Fig. 5. Dictydium cancellatum X 5 (p. 202). A group of blown out, 

 brown sporangia on slender, dark brown stalks. 



Fig. 6. Tubifera ferruginosa X 3 (p. 211). A group of nearly free, light 

 brown sporangia. In other developments the tendency to form aethalia-like 

 bodies is much more pronounced. 



