MYXOMYCETES. 71 



85. Arcyria cinerea. Bull. 



Sporangia ovate, or elongated-ovate, with an even, long, erect, 

 straight stem ; mass of capillitiuin and spores usually bright-grey, 

 more rarely greyish flesh-colour, greyish-yellow, straw-colour, or 

 dull yellow ; tubes of capillitiuin developed in the interior, and on 

 the outside of variable width, with variable thickenings, those of 

 the interior reaching *0042-'005 mm., and those of the outside 

 0021-'0025 mm. diam. Thickenings of the inner and outer not 

 equally spiny, but those of the interior warty, and the external 

 very spinulose ; spores *0066-'U083 mm. diam., smooth. Rtfki. 

 Mon., 272. 



On stumps. (Figs. 182-185, 193.) 



Clathrus recutitiiSj Linn. Sp., 1649 (1764). 

 Trichia, Hall., No. 2166 (1768). 

 Trichia cinerea, Bull., t. 477, f. 3 (1791). 

 Stemonitis recutita, Gruel. Sys., 1467 (1791). 

 Stemonitis cinerea, Gmel. Sys., 1467 (1791). 

 Arcyria albida, Eers. Disp., t. 1, f. 2 (1797). 

 Stemonitis glauca, Trent., p. 221 (1797). 



Arcyria cinerea, Schurn. Saell., 1480 (1803) ; Fl. Dan., 1. 1975, 

 f. 1 ; Eng. Fl., v., 318 ; Cooke Hdbk., No. 1172. 

 Trichia carnea, Wall, in litt. 

 Arcyria carnea, Wallr. Fl. Germ., 2234 (1833). 

 Arcyria tricliioides, Corda Ic., ii., f. 86 (1838). 

 Stemonitis grizea, Opiz. in Lotos, 215 (1855). 

 Arcyria pallida, B. & C. Grev. (1873), No. 365. 

 Arcyria stricta, Rtfki. Mori. Supp., p. 36. 



86. Arcyria Friesii. B.8fBr. 



Sporangia gregarious, globoso-ovate, stipitate, cinereous ; caprl- 

 litium with very confluent tubes of variable thickness, those in the 

 centre being the stoutest ; tubes of the centre only slightly warted, 

 or smooth, those of the exterior delicately warted ; capillitiunr 

 coarser than in A. cinerea; spores glaucous, globose, '009--01 

 mm. diam. Ann. N. Hist., No. 1602. 



On sawdust. (Figs, 251, 259.) 



Arcyria Friesii, B. & Br. Ann. N. Hist., No. 1602 ; Grevillea, v., 

 p. 13. 



Arcyria cinerea, Fr. S. M. iii., 180, not Ball. 



87. Arcyria incarnata. Pars. 



Sporangia in the type ovate, with an evanescent, short, erect 

 stem, crowded in clusters ; mass of spores and capillitruni usually 

 flesh-colour, more rarely rosy or umber, exceptionally ochre or 



