382 Natural History Bulletin. 



the apex and giving off on all sides, as to the apex, abundant 

 branches to form the capillitium ; capillitium open, the meshes 

 coarse and the nodes, especially within strongly dilated through- 

 out; spores globose, brown ^-S,u, strongly reticulate. 



To be compared with S. maxima Sz., from which it differs 

 in size, our species being much the larger, but also and espe- 

 cially in the loose coarsely meshed inner net with its strongly 

 dilated nodes. 



20. DiDYMiuM BARTERi Afassee. 



I have referred specimens to this species guided by descrip- 

 tion only, the author of the species having failed to figure it. 

 The correspondence seems sufficiently close except that in our 

 species the spores are only 8// in diameter instead of io-Ji/< as 

 recorded. Reference provisional. Collected at Castillo by 

 Mr. C. L. Smith. 



21. TiLMADOCHE OBLONGA Rostofinski. 



Typical. 



Collected by Mr. Shimek on low grounds at Ometepe. 

 The Plasmodium of this species was collected. The color 

 is bright 3'ellow. 



22. Physarum polymorphum Rostafinshi. 



My specimens correspond well with material identified by 

 the author of the species. 



Collected at Ometdpe by Mr, Shimek. 



23 Physarum nicaraguense Machride, n. s. Plate X, 

 Figs. 2, 2a and 2h. 



Sporangia multilobate or compound contorted, below ob- 

 conic, grey, ribbed with calcareous thickenings; stem short, 

 fuscous, longitudinally wrinkled; columella none, although the 

 lime massed at the center of each sporangium simulates one. 

 Capillitium white, densely calcareous, with heavy angular 

 nodules connected with comparatively short threads; spores 

 violet, globose, very rough, about 12^ in diameter. 



