EXPLANATION OF PLATE XX 



liaJluunia loii-cnsis ii. s., p. 36. 

 Fij;. 1. Spnraiij^ia several presentations, X 15. 

 Fi.LC. 1 a. C\Tpillitiuni, X 200. 

 Fis. 1 h. Sin.n;le spore, X 500. 



Pliysaniin rnorloni n. s., p. 5S. 

 Fig. 2. A K'niup of sporan.>;ia, X 20. 

 Fig. 2 a. Caiiillitiuiii, X 200. 



Physanim discoidalc n. s., p. 74. 

 Fig. 3. A group of sporangia, X 10. 

 Fig. 3 (t. A single spore, X 800. 



Didyiniiim an nil I alum n. s., p. 125. 

 Fig. 4. Ciroup of sporangia, X 15. 

 Fig. 4 a. Capillitiuni and spores, X 200. 



Olif/onrma hrr-vifiliun Peck, p. 280. 

 Fig. 5. Capillitium, X 800. 

 Fig. 5 a. The same. 

 Fig. 12/;. A single spore, X 800. 



Amaurocliacte tubulina (Alh. & Schw.) Machr., p. 150. 

 Fig. 6. Capillitium and spores, X 200. 

 Fig. 6 a. Spore, X 1200. 



Pliysarum hruniifo/iim (Phill.) Mass., p. 58. 

 Fig. 7. Group of sporangia. 



Fig. 7 a. The same, mature, dehiscence beginning, X 10. 

 Fig. 7 b. A single spore, X 800. 



Stcmonilis itvifcra n. s., p. 161. 

 Fig. 8. Colony, natural size. 

 Fig. 8 a. Capillitium ami spore-clusters, X 30. 

 Fig. 8 h. Single spore-cluster, X 600. 

 Fig. 8 r. Spore, X 1000. 



Stnnonilis trecliispora Berk., p. 160. 

 Fig. 9. Fructification — natural size. 



Fig. 9 a. Capillitium, branch and threads, X 20 — the spores enlarged. 

 Fig. 9 h. Netted spore, X 1000. Masking as an amaurochete; .7. tnr/ii- 

 spora perhaps; compare 11, etc., below. 

 Strmonitis flavnginila Jahn, p. 169. 

 Fig. 10. A group of sporangia, X 3. 

 Fig. 10 «. Capillitium sho\ving columella-tip, X 50. 

 Fig. 10 b. Spore, X 1200. 



Stemonitis trecliispora (Berk.) Torr., p. 159. 

 Fig. 11. A group of sporangia, X 3. 

 Fig. \\ a. Diagram of a single sporangium, a less rudimentar\ specimen, 



X 40. 

 Fig. 11 b. Capillitium enlarged to show branching columella, X 40. 

 Fig. llr. A single spore, X 1200. 



.Inyria poniiforniis (Leers) Rost., p. 255. 

 Fig. 12. A globose colony of sporangia, X 10; \ar. com/lnbosa. 

 Fig. 12 /;. See under 5, above. 



340 



