MYXOMYCETE8. 77 



0025 mm. wide, extending into numerous free arms, with the ends 

 usually slightly swollen : rarely with thickenings in the form of 

 scattered, curved, sharp pointed spines, '0016 mm. long ; spores 

 smooth, -0083--0092 mm. diam. Rtfki Man., 290. 



Lignidium quercinum, Fr. Stirp. Fenisj., 83 (1825). 

 Trichia circumcissa, Wallr. Fl. Germ., 2219 (1833). 

 Arcyria glomerata, Fr. S. V. S., 457 (1849). 

 Ophiotheca chnjsosperma, Curr. Micr. Journ. (1854), p. 240, t. ix., 

 f. 1, 5 ; Cooke Hdbk., No. 1176. 



Trichia Curreyi, Crouan. Fin., p. 16 (1867). 



Genus 42. OX.XGONEMA. R. 



Sporangium simple, splitting irregularly ; capillitiuni composed 

 of numerous, free, terminating, closed tubes. Rtfki. Mon., 291. 



(Fig. 198.) 



Family 18. PERICH^ENACE^. 



Sporangium or plasniodiocarp with single or double walls, the 

 outer of which often containing lime ; capillitiuni without charac- 

 teristic thickenings, combined into a net grown to the wall of the 

 upper part of the sporangium, very often almost obsolete. Rtfki. 

 Mon., 291. 



Genus 43. FERXCHJENA. Fries. 



Either plasniodiocarp, or sporangium often splitting with a 

 regular deciduous lid ; capillitiuni either combined into a thick net 

 with some of its arms grown to the upper part of the wall of the 

 sporangium, others running through free, or else hardly evident, 

 with scarcely a trace to be found in the whole sporangium ; tubes 

 of the capillitiuni without external thickenings, but sometimes 

 notched. Rtfki. Mon., 292. 



95. Fexichcena depressa. Lib. 



Sporangia very much flattened, gregarious, crowded, polygonal, 

 contiguous at the sides, brown-red, or nut-brown, shining, opening 

 with a truncate lid ; mass of spores and capillitiuni yellow ; 

 capillitium well enough developed, with tubes diversely produced 

 of variable width -008--012 or -025--033 mm. ; spores globose, 

 smooth -009-0011 mm. di&m.Rtfki. Mon., 292. 



Bungay. (D. Stock in Herb. Berk.) 



Perichcena vaporaria, Schw. Am., 2311 (1831). 

 Perichcena depressa, Libert Exs., No. 378 (1837). 

 Stegasma depression. Corda Ic. V., f. 13 (1842). 



