CLASTODERMA 191 



For a similar case, see under Prototrichia metallica, Mycetozoa 

 2nd ed., p. 261. 



South Carolina, type; Colorado. 



2. Clastoderma Blytt 

 1880. Clastoderma Blytt, Bot. Zeit., XXXVIIL, p. 343. 



Sporangium globose, distinct, stipitate; the columella short or obso- 

 lete; the capillitium of few sparsely branched threads, which bear at 

 their tops the persistent fragments of the peridium, but are not other- 

 wise united. 



Distinguished from Lainproderma by the peculiar manner in which 

 the peridium is ruptured, and by the simplicity of the scanty capil- 

 litium. So far there appears to be but a single species. 



1. Clastoderma debaryanum Blytt. 



Plate XIII., Fig. 6, and Plate XVI., Fig. 13. 



1880. Clastoderma debaryanum Blytt, Bot. Zeit., XXXVIIL, p. 343. 

 1886. Orthotrichia microcephala Wing., Jour. Myc, II., p. 126. 



Sporangia scattered or gregarious, very minute, 1-12 to ^ mm. in 

 diameter, the peridium fugacious, except the minute patches that ad- 

 here to the capillitial branchlets, and the slight annulus at the base of 

 the columella; stipe long, unequal, dark below, above paler; columella 

 almost none, giving early rise to the comparatively few slender 

 threads which by their repeated forking make up the capillitium; 

 spores globose, even, violaceous, 8-9 ju,. 



Reported in the United States so far from Maine, Pennsylvania, 

 Ohio, and Illinois. 



The sporangia are very small, but beautiful, delicate little struc- 

 tures, found on the bark of living red oak in this country ; in Norway 

 it seems to have been seen first on a dead polyporus. Its minuteness 

 doubtless causes it to be generally overlooked, N. A. F., 2498. 



3. Lamproderma Rostafinski 

 1873. Lamproderma Rostafinski, Versuch, p. 7. 



Sporangia stipitate, globose, or ellipsoid ; columella cylindric or 

 inflated or clavate at the apex, scarcely attaining half the height of 



