NiCARAGUAN MxYOMYCETES. 379 



cal3'x proper small, its ribs extended upwards Dictydimn-\\\;.Q 

 and connected at intervals by very delicate transverse bars 

 which are also extremely regular. The net is comparatively 

 limited, but well-formed with angular nodes connected with 

 each other in all directions by delicate threads which form 

 sometimes a network in the intervals of the larger net, no free 

 ends; stipe very long about eight times the diameter of the 

 sporangium borne on a small hypothallus and tapering very 

 slightly upwards, purple by transmitted light; spores 5-6 /u, 

 smooth, pale purple. 



This species belongs to Rostafinski's genus Hetcrodictyon^ 

 a genus by Massee, properly I think, united with Cribraria. 

 The present species is accordingly to be compared with C. 

 7mrabilis (Rost.) Mass. and C. hieniazzii (Racib.) Mass. 

 From both these it is instantl}'' distinguished by the color and 

 great length of stem, as well as by all microscopic characters. 



Collected by Mr. Shimek on rotten wood near Castillo Viejo. 



3. Perich^na depressa Libert. 



Typical. Collected in abundance by Mr. Shimek at Ometepe. 



4. CoRNUviA wRiGHTii Berkeley and Cooke. 



Typical. Common at Ometepe. Collected by Mr. Shimek. 



5. Arcyria cinerea BuUiard. 



Typical, though rather large. Common at Castillo. Mr. 

 Shimek. 



6. Arcyria punicea Persoon. 

 Typical. Castillo and Ometepe. 



7. Arcyria digitata Rostajinski. 

 Typical. San Carlos, on River San Juan. 



8. Lycogala epidendrum Buxbaufn. 



Referred to this species is a single specimen from Castillo. 

 The specimen is very small, only 5 mm. in diameter. The 



