380 Natural History Bulletin. 



spores typical, rough and 611 in diameter. The peridium rough 

 with minute bHck points. By mistake the spores of this spe- 

 cies were on page 127 described as smooth. 



9. Hemiarcyria rubiformis Pcrsoon, 



Rather poor specimens of the t3'pe H. gemiina. From Ome- 

 tdpe and Castillo. Mr. Shimek and Mr. Smith. 



10. Hemiarcyria clavata Pcrsoon. 



Spores reticulate. Capillitium smooth as in a single Iowa 

 specimen referred to on page 134 of this volume. Found 

 only on Ometepe. Mr. Smith. 



11. Hemiarcyria serpula Sco-poli. 



Typical and abundant. Remarkable for its uniformly reticu- 

 late form. Collected at Ometepe and Castillo. 



12. Comatricha longa Peck. 



Fine specimens of this species. Sporangium an inch or 

 more long. 



13. Comatricha SHIM EKiAN A J/fTT^m/c. n. s. Plate X, Figs. 



3, 3.'? and 3^. 



Sporangia depressed-spherical or spherical, covered at first 

 as usual with a thin iridescent peridium. Stipe slender, taper- 

 ing from an indistinct hypothallus, branching immediately on 

 entering the sporangium into several uniform divisions which 

 support the very dense net. Spores smooth pale 7~9/"- 



" On a log projecting above the water of the Savalos River 

 12 miles above Castillo el Viejo." Collected by Mr. Shimek. 



This is a beautiful species. The spherical sporangia resem- 

 ble spherical forms of C. fricsiana R., but are very much 

 larger, two or three times as large; the capillitium of the 

 present species is also to be distinguished by its immediate 

 and symmetrical branching. The branching of C. friesiana R., 

 even in spherical forms follows the type of the cylindrical, 

 forms and shows something of a central columella. 



