MYXOMYCETES. 47 



ferruginous-cinnamon ; surface of the net of the capillitium with 

 very small meshes, but little larger than the spores ; spores bright 

 ferruginous, *0053-'0 ( J75 mm. diam. Rtfki. Mon., 196. 



On rotten wood. (Figs. 31-39, 41-44, and 50.) 



Stemonitis tuphina, Willd. Ber., 408 (1787). 

 Clathrus nudus, Bolt., t. 93, f. 1 (1789). 

 Trichia axifera, Bull., t. 447, f. 1 (1791). 

 Stemonitis fasculata, Pers. Syn., 187 (1801). 

 Stemonitis violacea, Schum. Saell., 1491 (1803). 

 Stemonitis fasciculate, DC., Fl. Fr., ii., 256 (1805). 

 Stemonitis ferruginea, Ehr. Syl. Ber., f. vi. a b (1818) ; Cooke 

 Hdbk., No. 1156. 



Stemonitis decipiens, Nees. Nov. Act. Leop., xvi., 95, (1821). 

 Stemonitis heterospora, Oudem. Ned. Kr. Arch, i., 167 (1872). 



Genus 18. COMATRICHA. Prenss. 



Sporangium cylindrical or globose, stipitate ; stem prolonged 

 immediately within the walls of the sporangium as a columella, 

 usually to nearly its length ; columella attenuated upwards, reach- 

 ing at least three-fourths the height of the sporangium ; capilli- 

 tium originating from the columella, usually its numerous forked 

 threads combined into a net, but at the surface of the sporangium 

 not formed into a network parallel to the walls ; walls of sporan- 

 gium usually very evanescent, now and then even falling away 

 entirely. Rtfki. Mon., 197. 



54. Comatricha typhina. Roth. 



Sporangia growing in company, but not crowded, cylindrical, 

 obtuse, those in the centre narrower, a little bent on one side ; 

 stem shorter than the sporangium; columella in the centre 

 derived from the lengthened stem, extending to the apex, and 

 then cleaving it with the numerous ends of the threads of the 

 capillitium ; threads of the capillitium numerous, flexuous, dull 

 brownish, with numerous branches, formed into a very intricate 

 net; walls of the sporangium always thin ; spores bright-violet, 

 smooth, -0046--0067 mm. diam. Rtfki. Mon., 198. 



ft-, geixuina. Sporangium, with stem, 21 to 4 mm high, 

 p. puznila. Sporangium, with stem, 2 mm. high. 



On rotten wood. (Figs. 46, 47.) 



Clathroidastrum obscurum, Mich., t. 94, f. 2 (1729). 



Mucor capitulo fusco, Scop. Fl. Cam., 66 (1760). 



Mucor Stemonitis, Scop Fl. Cam., 493 (1772); Sohff., t, 296. 



Embolus lacteus,J&cc[. Muse, i., t. 6 (1778). 



