EXPLAXAl'IOX OF PLATE XIX 



Diiiydhun (lunrll/iluin I>;itsc'h, p. 230. 

 Fig. 1. The finest pliase, as the turm appears in the Mississippi valles', 



X 15. 

 Fig. 1 a. Sp()raii<;iiiin of the same seen from be]o\v, X 3 5. 

 Fig. 1 /;. Sporangium — same — seen from above, X 3 5. 

 Fig. 1 r. Cribraria-like net from the top, X 200. 

 Fig. 2. A'ertical section of Avhat is believed the typical European form, 



X 20. 

 Fig. 3. An ellipsoidal piriform phase — var. prolaltim, X 15. 



irum (omprrssum Alb. .^- Schw. form /'. affiiu- Rost., p. 80. 

 A group of sporangia, X 12. 

 A single spore, X 600. 

 Capillitium, same species, X 300. 



.Ihi-isia homharda lierk. .^- Hr., p. 209. 

 Open sporangia, X 6. 

 Sporangium of saine enlarged to sho^v capillitium, X 20. 



Crihraria duty diodes Cke. & Balf., p. 222. 

 A group of sporangia, X 6. 



Single sporangium of same — lateral view, X 25. 

 Same; base view, X 30. 



Crihraria aurantiaca Schrad., p. 221. 

 Single sporangium, X 30. 



Crihraria nifa (Roth) Rost., p. 220. 

 Sporangium, X 30. 



Crihraria piriformis Schrad., p. 224. 

 Sporangium, X 30. 



Crihraria splrndrns (Schrad.) Pers., p. 221. 

 Sporangium, X 30. 



Kchinostclium miniilum DeBx., p. 198. 

 Several sporangia, X 15. 

 \"ertical section, after Rost., X 500. 



Physarum (omprrssiim Schw., p. 80. 

 Fig. 12. Sporangium, X 20, to show dehiscence. 



Didyiniiitn anoinaliini Sturg., p. 127. 

 Fig. 13. Plasmodiocarps, about natural size. 

 Fig. 13 a. Diagrammatic vertical section, etc., to show the calciferous pillars 



distinguishing the species, X 200. 

 Fig. 14. Calcic crystal — enlarged. 



Physarum sinuosum (Hull.) Wiiinn., p. 52. 

 Fig. 15. Plasmodiocarps passing to sporangia, X 5. 

 Cf. Plate VIII., 6 and 6 a. 



Physarum hilrdum List., p. 53. 

 Fig. 16. Plasmodiocarps as in 15, showing transioiial phases, X 10. 



338 



