1893.] NATURAL SCIENCES OF PHILADELPHIA. 369 



face dark umber shading to black in the center; sporangium-wall 

 smooth, brittle, rupturing irregularly, basal fragments more or less 

 permanently reflexed, apparently double, or at least composed of 

 two easily separable layers ; outer layer umber, mottled, colored by 

 the innate granules of lime, inner layer pure white throughout 

 except a narrow ring of pale umber brown around the columella, 

 inner surface pitted with numerous minute indentations as with a 

 needle point; columella flat, discoidal *5 mm. in width, pale ochra- 

 ceous color on surface; capillitium sparse, white or colorless 

 composed of simple rarely forked sinuous threads, occasionally 

 joined by lateral branches, attached below to the columella and 

 adjoining portion of the basal sporangium-wall and above to the 

 upper sporangium- wall ; stipes variable, sometimes scarcely evident, 

 sometimes one mm. high, black, longitudinally ridged, more or less 

 flattened laterally according as the sporangium is elliptical or 

 circular; spores dark violet 12-14// in diameter, epispores thick, 

 distinctly warted with sufficient amplification. 



Roan Mt., Tennessee. 



The affinities of this species are with the section of the genus 

 represented by C. radiatum. It differs from the other discoidal or 

 orbicular species in its dark chestnut umber color, its well marked 

 discoidal columella and jet black irregular stipe. 



Chondrioderma rugosum n. sp. 



Plasmodium gray ; sporangia grayish or dusky white becoming 

 brownish at the margin of the base, shading into chestnut-brown 

 around the point of insertion of the stipe ; sporangia stipitate, nearly 

 hemispherical, flattened and slightly umbilicate at the base, i to f 

 mm. in diameter at the base ; sporangium-wall single, papyraceous, 

 much wrinkled or traversed by ridges which mark the lines of 

 rupture and dehiscence and are combined so as to divide the wall 

 into twenty-five to thirty shallow irregularly polyhedral portions 

 which fall away on the scattering of the spores ; stipes subulate, lon- 

 gitudinally rugose, brownish-black becoming brown above, one-half 

 to two-thirds of a mm. in height; columella chalky or yellowish- 

 white, clavate, much roughened in the upper portion, penetrating to 

 one half the height of the sporangium ; capillitium white or color- 

 less, composed of simple tubules freely forked and combined by 

 lateral branches into a loose network attached to the columella and 

 basal wall of sporangium below and the upper sporangium-wall 

 above; spores 10// in diameter, warted, violet-brown in color. 



