12 
OHIQ BIOLOGICAL SURVEY 
3. PHYSARUM. Persoon. 
Physarum nutans Pers. Plate II, Fig. 2. 
Physarum polycephalum Schwein. Plate II, Fig. 5. 
Physarum sinuosum (Bull.) Weinn. Plate II, Fig. 4. 
Physarum vernum Somm. Plate II, Figs. 3, 3a, and 3b. 
Physarum viride (Bull.) Pers. Plate II, Figs. 1 and la. 
Sporangia distinct or plasmodiocarpous, stalked or sessile. Sporangium 
wall single or double containing lime granules. Capillitium a network 
with expanded nodes containing deposits of lime. 
A. 
Sporangia always sessile. (Nos. 12, 14, 15, 19, 22, and 28 are sometimes sessile). 
B. Sporangia white or gray. 
C. Outer sporangia wall very smooth. 
D. Outer wall forming a shell like crust. 
D. Outer wall not shell like. 
C. Outer sporangia wall not very smooth. 
E. Sporangia strongly compressed laterally, sinuous. 
E. Sporangia not laterally compressed. 
F. Spores 7 to 8mmm. in diam. 
F. Spores 9 to llmmm. in diam. 
B. Sporangia yellow. 
G. Lime knots white. 
G. Lime knots yellow. 
H. Spores 10 to 12mmm. in diam. 
H. Spores 7 to 9mmm. in diam. 
B. Sporangia red or brown 
I. Lime knots white. 
I. Lime knots orange or red. 
J. Lime knots angular. 
J. Lime knots rounded. 
1. P. testaceum 
2. P. bitectiim 
3. P. sinuosum 
4. P. cinereum 
5. P. vernum 
6. P. contexium 
7. P. serpula 
8. P. virescens 
9. P. atrum 
10. P. rubiginosum 
11. P. lateritium 
A. Sporangia stalked. 
K. Sporangia white or gray. 
L. Stalk yellow. 
M. Sporangia clustered. 
M. Sporangia single. 
L. Stalk white, sometimes dark. 
N. Sporangia ovoid. 
N. Sporangia globose, or subglobose. 
O. Stalk stout. 
P. Sporangia laterally compressed. 
P. Sporangia globular. 
O. Stalk slender. 
Q. Capillitium very persistent. 
Q. Capillitium slightly persistent. 
N. Sporangia lenticular. 
L. Stalk red. 
X. Columella prominent. 
X. Columella wanting. 
K. Sporangia yellow. 
12. P. polycephalum 
13. P. nucleaium 
14. P. didermoides 
15. P. compressum 
16. P. leucopus 
17. P. globuliferum 
18. P. comp actum 
19. P. nutans 
20. P. penetrate 
21. P. pusillum 
