76 ENDOSPOREi®. [CHONDRIODEEMA. 



KEY TO THE SPECIES OF GHONDRIODERMA. 



A. Sporangium-wall densely calcareous {jEuohondrioderma) : — 



A. Spores reticulated. ' 2. C. suhdictyospermwm 



B. Spores not reticulated — 



a. Columella white or pinkisli, sporangia white. 



Spores violet-brown, 7 to 11 /a diam. 



1. C. spumarioides 

 Spores dark purpUsh-brown, 10 to 14 jn diam. 



3. C. glohosum 



b. Columella flesh-coloured, hemispherical or flattened. 



Sporangia subglobose, sessile, pink — 



4. C. testaceum 

 Sporangia disc-shaped, stalked, columella flattened. 



5. G. MicheUi 

 Sporangia forming plasmodiocarps, white. 



6. C. reticidatitm 

 0. Columella orange, hemispherical, or hardly evident. 



7. C. nivevmi 

 d. Columella red-brown, clavate or cylindrical. 



8. G. LyaMi 



B. Sporangium-wall cartilaginous {Leangivm) : — 



A. Sporangium-wall white and crystalline on the inner side. 



9. G. Trevehjomi 



B. Sporangium-wall without a crystalline layer — 



a. Spores with widely scattered warts. 



13. G . floriforme 



b. Spores closely spinulose, warted, or nearly smooth — 



Columella hardly evident, sporangia sessile. 



10. G. Sauteri 



Columella hemispherical or subglobose ; stalk stout, 

 ochraceous. 11. G. radiatwm 



Columella clavate, white ; stalk slender, black. 



12.. G. rugosum 



Columella cyhndrical, brown ; stalk dark brown. 



14. G. Hookeri 



Columella stipitate, brown ; stalk orange. 



15. C. hmdum 



Sub-genus 1. — Euchondriodenua. Sporangia sessile, rarely 

 stipitate ; sporangium-wall double, the outer layer a smooth crust 

 composed of globular lime-granules, the inner membranous, more 

 or less separating from the outer layer. 



1. C. spumarioides Eost., Mon., p. 174, figs. 142 to 145, 151 

 (1875). Plasmodium white, among dead leaves. Sporangia sub- 



