92 



Mycetozoa of North America 



Section 1. Eudiderma. Outer sporangial wall a smooth 

 densely compacted lime-granules. 

 Sporangia stalked. 



Sporangia white or pinkish, subglobose, always 



stalked; spores pale, faintly marked. 1 



Sporangia white, flattened, disc-shaped, usually 

 on stout stalks, rarely sessile; spores pale, 

 faintly marked. 

 Sporangia shortly stalked or sessile, white or 

 mottled with flesh -colored spots, subglobose; 

 columella prominent; spores dark, coarsely 

 • warted. 

 Sporangia usually sessile or forming plasmodio- 

 carps. 

 Sporangia white or nearly so. 



Sporangia rounded or forming plasmodio- 

 carps; columella depressed, brownish flesh- 

 colored; spores 6-10 ii. 

 Similar to No. 3, but sporangia scattered 



and spores 10-15 /u. 

 Sporangia crowded, subglobose; columella 

 white, convex; layers of the sporangial 

 walls closely combined; spores violet- 

 brown, 8-11 At. 

 Sporangia crowded, subglobose; columella 

 small, white, convex; outer sporangial 

 wall shell-like, separating from the per- 

 sistent, colorless, inner wall; spores pur- 

 plish brown, 10-14 n. 

 Sporangia crowded, usually forming plas- 

 modiocarps with shell-like outer walls; 

 columella convex, flesh-colored. 

 Sporangia crowded, subglobose; inner wall 

 orange below; columella subglobose or 

 hemispherical, orange or flesh -colored; 

 spores 9-13 n, spinulose. 

 Sporangia pinkish or reddish when fresh, later 

 white, rounded, circular, and depressed, or 

 subglobose. 

 Sporangia ochraceous, yellowish, or brownish, 

 depressed, irregular or forming plasmodio- 

 carps; wall single. 

 Section 2. Leangium. Outer sporangial wall carti- 

 laginous. 

 Sporangia stalked. 



Sporangia globose, smooth, gray to ochraceous 

 brown; stalks thick, ochraceous brown; spores 

 with scattered warts. 



crust composed of 



D. montanum 



D. hemisphericum 



2. 



9. D. Lyallii 



3. D, effusum 



4. D. Chondrioderma 



5. D. spiimari aides 



6. D. globosum 



7. D. alpinum 



8. D. niveum 



10. D. testa ceiim 



11. D. simplex 



15. D.floriforme 



