124 Natural History Bulletin. 



woods better than some others retain the moisture. It is 

 readily distinguished from other species of the sub-genus; 

 from the preceding by its color; from A. fomi/onnis, Roth., 

 by its habit (crowded) and the character of the capilHtium, — 

 spinuiose in A. -pomiformis. The delicate half-rings in A. 

 ■piuiicea form a more or less spiral series around the capillitial 

 thread. 



Suh-gCH'.is Arcyrella^ Rjs'ajinski. , 



14. Arcyria adnata, Batsch. 



Sporangia, crowded or gregarious on a distinct hypothallus, 

 ellipsoidal; stipe short but distinct. Spores and capillitium 

 ochraceous with a carmine flush; tubes of capillitium equal, 

 adorned with abundant half-rings, cross-plates, or often sharp 

 edged plates, which appear in section like spines, very vari- 

 able. Spores concolorous with capillitium., smooth, .007-.008. 



This species resembles the preceding in nearly every par- 

 ticular and is distinguishable only by -observing the attach- 

 ment of the capillitium. Both tubes and spores may often 

 be traced far down into the stem. The peridia are as a rule 

 larger in the present species and likewise the spores. A. 

 adnata is with us much brighter colored, often a brilliant 

 carmine brown, vying with Hcmiarcyrla rnhifonnis. Habitat 

 the same as the preceding species; plasmodia white. Sep- 

 tember — December. 



15. Arcyria vitellixa, Phillips. Plate II, Figs. 4 and \a. 



Sporangia crowded, large, short stipitate, ovoid or cylindric, 

 luteous, opening by an irregular circular fissure. Capillitium 

 shining luteous, elongate -clavate, nodulose; threads with 

 minute tubercles and distant rings. Spores conColorous, .010 

 in diameter. 



The specimens referred to this species occur rarely with, 

 us. The sporangia are crowded on a distinct hyphothallus. 



