414 Natural History Bulletin. 



On bark of decaying tree, Castillo Viejo. (C. L. S.) 



X. CORNIFORMIS Fv. 



On fallen tree, Ometepe (B.S.); and Castillo Viejo (C.L.S). 

 The specimens from Castillo Viejo were mostly immature. 



X. HYPOXYLON i^Litm.) Grev. 



On dead trees, Ometepe (B. S.) ; and Castillo Viejo (C. L. S). 



X. RHYTIDOPHLCEA Moilt. 



Simple. Stroma indurate, horny, compressed-terete, obtuse 

 or horn-shaped, black, opake, very finely rugulose-reticulate, 

 sooty within and very short stiped. Perithecia peripherical, 

 globose, immersed, black stuffed, with slightly prominent osti- 

 olum. Asci as in the genus. Sporidia very small, oblong- 

 ovoid, fuscous. 



On denuded wood Cayenne (Leprieur), Melbourne, Aus- 

 tralia (Mueller). [Sacc. Syll. I, p. 319.] 



On dead tree, Castillo Viejo. (C. L. S.) 



X. CYLINDRICA E. & E. n. sp. 



Simple, erect, small (i^ cm. high), stipitate, dark-brown. 

 Head cylindrical, white inside, smooth except for the sHghtly 

 prominent papilliform ostiola, about 8 mm. long and 2 mm. 

 thick, abruptly narrowed at the apex into a short (i mm. or 

 less), erect, mucronate tip. Stipe erect, straight, slender, hir- 

 sute-tomentose (becoming sub-glabrous), about as long as 

 the head. Perithecia buried, sub-globose, about ^ mm. dia. 

 Sporidia uniseriate, navicular-oblong, brown, often 2-nucleate, 



sub-obtuse, 8-11x3 >^-4y". 



Smaller than X. mucronaia Sch., with different sporidia. 

 The buried perithecia and even surface of the stroma will 

 distinguish this from X. hypoxylon. 



On bark, Omettfpe; and Castillo Viejo (C. L. S). 



