122 Natural History Bulletin. 



CORNUVIA, Rostafinski. 



Fruiting phase assuming the form either of distinct sporan- 

 gia or plasmodiocarpous. Peridia opening irregularly or some- 

 times with a lid. Capillitium, a free net, adorned with papillae, 

 spinules, or ring-like thickenings. 



II. CoRNUviA wrightii, jS^r^e/ej and Ct>(9i^. Plate II, Figs. 

 7, 7^ ^nd ^h. 



Fruiting phase various, sometimes single, spherical, nut- 

 brown sporangia opening irregularly, more frequently in O- 

 shaped or U-shaped plasmodiocarps, or vein-like, creeping. 

 Spores and capillitium bright yellow. Threads of the capilli- 

 tium .002-.003 wide, adorned with scattered spinules about 

 equalling in length the thread's diameter. Spores delicately 

 warted, about .012. 



The fruit of this species is like that of Perichcena corticalis 

 in general appearance, as in color of spore-mass, and in habitat; 

 is however easily distinguished by its irregular forms, as by 

 its capillitium and other microscopic characters. Found not 

 uncommon in September and October on half-rotten logs and 

 bark, particularly of elm-trees. The species appears to run 

 into C. circimiscissa Vail, by way of C. circiimscissa var. s^inosa, 

 Schroeter. 



ARCYRIA, Hill. 



Sporangia simple, at first spherical or ovate, stalked, gen- 

 erally resting upon a common hypothallus. Peridium opening 

 by a quasi-circumscissile dehiscence, the upper part vanishing, 

 the lower remaining as a cup. The capillitium united to form 

 an intricate closed net, which at the rupture of the peridium, 

 suddenly springs aloft, widens and lengthens, free above but 

 still adherent to the peridial walls below. Spore-mass and 

 capillitium white, yellow or red. (Schroeter). 



