368 PROCEEDINGS OF THE ACADEMY OF [1893. 



colored granules of lime; spores pale brown 11-12// in diameter; 

 epispores sparsely covered with minute papillae interspersed with a 

 variable number of from four to eight large irregular dark violet 

 papilke apparently, which are resolved by sufficiently high ampli- 

 fication into dense clusters of from five to eight closely aggregated 

 small papilla?; capillitium sparse, brown-violet in color, composed of 

 rigid, straight, tapering threads arising from the columella and base 

 of the sporangium, joined by a few lateral branches in the middle 

 and near the ends into a loose open network ; threads 3-7,u in thick- 

 ness at the basal point of attachment, tapering to a point at their 

 attachment to the sporangium-wall ; hypothallus variable, usually 

 membranous with scattered deposits of ochre-colored lime granules, 

 but thick and crustaceous with lime when the sporangia are sessile. 



Mitchell Co., North Carolina (Lancaster Thomas.) 



This species and the two other distinctively North American 

 species D. splendens Pk. and D. subsessilis Pk. are characterized by 

 peculiarly specialized spore sculpturings, which would sufficiently 

 serve to distinguish them from the cosmopolitan species D. leucopoda, 

 even if their general characters were not equally well marked. 



The spore markings of D. thomasii as given above, differ greatly 

 from the others. 



In D. splendens the epispores are studded with irregularly scattered, 

 long, projecting columnar processes which are truncate or flat at the 

 end, not spinose or rounded. These are sometimes joined at various 

 angles forming elongated or angular bars. 



In D. subsessilis the epispores are marked with diffusely branched 

 rows of minute dark bead-like papillae ranged side by side in a 

 moniliform manner, sometimes terminating in free ends, sometimes 

 running in a zig-zag irregular manner, but usually combined into a 

 loose reticulation with large irregular meshes. 



The epispores of D. leucopoda are delicately warted in a uniform 

 manner, like those of many species of the Calcarea? and Stemonit- 

 acese. 



Chondrioderma roanense n. sp. 



Sporangia stipitate, discoidal, either circular or irregularly 

 elliptical in outline, thin, flattened or slightly convex above, plane 

 or plano-concave below, about one mm. in diameter when circular, 

 or one by one-half mm. when elongated ; upper surface of sporangia 

 mottled, presenting the appearance of large irregular spots of dark 

 umber joined by narrow bands of a paler brown color; under sur- 



