Physarum. 281 



irregularly angular, filled with lime, connected at several points 

 by very thin, short internodes ; spores globose, dirty lilac, very 

 minutely verruculose, 6 7 p diameter. 



Physarum 'Irunneolum, Phil., in Herb. 



Diderma brunneolum, Phillips, Grev., v., p. 114, t. 87, f. 3, 

 a./; Saca, SylL, vii., 1, 1292. 



(Type in Herb., Phillips.) 



On oak bark. San Francisco. 



A very beautiful and remarkable species, reaching up to 

 1 mm. in diameter. Intermediate between the genera Chon- 

 drioderma and Physarum, agreeing with the former in the 

 polished, porcelain-like sporangial wall dehiscing in a stellate 

 manner, and with the latter in the structure of the capillitium, 

 whereas the very large and numerous nodes of the capillitium 

 separated from each other by constrictions rather than by true 

 internodes, suggests affinity with the genus Badhamia. 



Physarum Ravenelii, Mass. (figs. 234, 235). fc \>v 



Scattered, stipitate ; sporangia perfectly spherical, not um- 

 bilicate, dirty brown, sometimes rugulose ; stem elongated, rather 

 slender, equal or slightly fusiform, coloured like the sporangium, 

 filled with granules of lime ; columella absent ; capillitium 

 copious, forming an irregular net ; nodes small, filled with yellow 

 granules of lime, internodes thick, elongated, colourless, empty; 

 spores dingy lilac, globose, very minutely verruculose, 6 7 /x 

 diameter. 



Didymium Ravenelii, Berk, and Curt., Grev., vol. ii., p. 53 ; 

 Sacc., Syll., vii., 1, n. 1318. 



(Type in Herb. Berk., n. 10,771.) 



On wood. Sulphur Springs, N. Carolina. 



From 2'5 3 mm. high. Remarkable for the dirty brown 

 colour of sporangium and stem. In form and size almost 

 identical with Physarum. Kalchbrenneri. The knots of the 

 capillitium are small and usually elliptical, resembling those 

 characteristic of Tilmadoche, but the capillitium is altogether 

 too robust to admit of the present species being placed in the 



