632 PEKISPORIALES. 



Sub-class 2. ASCOMYCETES. 



Spores borne in perithecia which are closed or open to the exterior by an ostiolum. 

 Ostiolum wanting or obscure ; vegetative mycelium su- 

 perficial. Order 1. PERISPOKIALES. 

 Ostiolum present and often conspicuous ; vegetative 



mycelium not as above. 



Perithecia consisting of cavities in the stroma with- 

 out well developed wall. Order 2. DOTHIDEALES. 

 Perithecia provided with well developed wall, with 



or without stroma. 



Perithecia and stroma bright colored, fleshy. Order 3. HYPOCREALES. 



Perithecia and stromata black, usually carbon- 

 aceous. Order 4. SPHAERIALES. 

 Spores borne in apothecia with the hymenium freely ex- 

 posed at maturity. 



Hymenium circular or subcircular in form. Order 5. PEZIZALES. 



Hymenium elongated, often opening with a slit-like 



aperture. Order 7. PHACIDIALES. 



Order 1. PERISPORIALES. 



1. Dimerosporium guarapiense Speg. Anal. Soc. Cient, Arg. 17: 130. 1884. 



On Cestrum bahamense Britton, Great Bahama : South America. 



2. Dimerosporium zonatum Seaver sp. nov. 



Superficial mycelium rather scant but giving the surface of the leaf a 

 blackish appearance; perithecia black and arranged so as to give rise to a 

 series of rings, the outer one usually reaching a diameter of 5 mm., the indi- 

 vidual perithecia small, pyriforin, reaching a diameter of 100 /j., surrounded with 

 brownish appendages; asci broad-clavate, with a short stem-like base, reaching 

 a diameter of 16-20 M and a length of 40 At; spores eliipsoid-fusoid, 1-septate 

 and slightly constricted at the septum, about 5-6 X 16-20 p. 



On Corcliorus hirsutus L. Type collected by N. L. Britton and C. F. Millspaugh 

 at Barrett's Point, Great Bahama, February 5-13, 1905. 



3. Meliola ambigua Pat. & Gaill. Bull. Soc. Myc. Fr. 4: 104. 1S88. 



On Lantana involucrata L., New Providence: Porto Rico; South America. 



4. Meliola longipoda Gaill. Bull. Soc. Myc. Fr. 8: 178. 1892. 



On Tournefortia volubilis L., New Providence :-. Porto Rico ; South America. 



Meliola simillima Ellis & Ev. Eep. Missouri Bot. Garden 9: 118. 1898. 



This species, recorded by Ellis as from Nassau, was really from Bog Walk, Ja- 

 maica, as shown by the specimen. 



5. Perisporium Wrightii Berk. & Curt. Grevillea 4: 157. 1875. 



On Opuntia Dillcnii (Ker.) Haw., Inagua : Cuba; Texas. 



Order 2. DOTHIDEALES. 



1. Phyllachora Ateleiae Seaver, sp. nov. 



Stromata rather numerous, appearing on either side of the leaf but more 

 conspicuous on the upper side, black, shining, scarcely exceeding a diameter of 

 1 mm. perithecia few to each stroma, conspicuous; asci clavate, reaching a 

 diameter of 14-16 /u; spores fusoid, hyaline, 4-5 X 18-20^. 



On Ateleia cubensis Griseb., Andros, New Providence, Great Exhuma. Type 

 collected by J. K. Small and J. J. Carter, on Andros, January 25-27, 1910, 8715. 



