EXPLANATION OF PLATE XVI 



Physmi'lla ohlontja (Berk, t^- C.) Morgan, p. 109. 

 Fig. \. Fully opened sporangium, X 10. 

 Fig. 1 a. I'uliular sporangia closed, X 5. 

 Fig. \ b. 'l"rans\erse section of sporangium; sho^YS trabecular calcareou- 



nodules of the capillitium, X 15. 



Cratcrium t yli ii J r i rum Mass., p. 106. 

 C/roup of sporangia, X 10. 



Pliysaruin ^Lvi/u/dlrnsr Macbr., p. 72. 

 Ciroup of sporangia, X 10. 



Pliysariun alhrsccns Ellis, p. 86. 

 Ciroiip of sporangia, X 10. 

 Capillitium of the same species, X 200. 



Diane ma liarzwyi Rex, p. 238. 

 C J roup of sporangia, X 10. 

 S a. Clustered spores, D. corticatiutij X 500. 



Capillitial threads and spores, D. Iiarveyi, X 200. 

 Twisted, spirally striate single threads, X 500; D. corticatum, 

 List. 



Pliysartlla oblont/a Berk. & C. p. 109. 

 Fig. 6. Terrestial, plasmodiocarpous phase, X 10. 



Physarum mrgalosponim Sturg., p. 63. 

 (jroup of sporangia, X 8. 

 Capillitium and spores, X 150. 



Didymiiim com planatiim (Batsch) Rost., p. 116. 

 Capillitial structure, X 200. 



Physarum <u;'nitialnisr, p. 72. 

 Sporangium, X 20, enlarged to show dehiscence. 



Didymium xantliopus (Ditm.) Fr., p. 123. 

 Sporangium — diagram to show columella, X 20. 



Didymium rximium Pk., p. 124. 

 Group of sporangia, X 10. 

 Fig. 11 fl. Section of sporangium, X 30; diagram. 

 Fig. 11 b. Spore, X 750. 



Comatriilia t'lfc/ans (Racib.) List., p. 182. 

 Fig. 12. A single sporangium, X 20. 



Clastoderma drhaiyatium, p. 191. 

 Fig. 13. Sporangium, seen in section, X 20. 



Slrmonilis hcrbatica Pk., p. 171. 

 Fig. 14. Group of sporangia, X 2. 

 Fig. 14 fl. The same enlarged to show general outline. 

 Fig. \Ab. The same; capillitial section, X 20. 

 Fig. 14 f. A single spore, X 1000. 



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