528. TKTPETHELIAGEAE. 



5. Antliracothecium americanum (Aeh.) Muell. Arg. Flora 68: 339. 1885. 

 Verrucaria analepta var. americana Aeh. Lieh. Univ. 2-75. 1810. 



On (Jead wood, Abaco, at Old Kerr's Point, and on bark of Drypetes diversifoUa, 

 Thatcn Cay, Long Island : — Jamaica. 



Family 3. TRYPETHELIACEAE. 



'Spores plurilccular (two to many-celled). 

 Spores colorless. 



Spores with cylindrical cells. 1. Tomasellia. 



Spores with lens-shaped cells. 2. Trypethelium. 



Spores brown. 3. Melanotlieca. 



Spores murilorm-multilocular, brown. 4. Bottaria. 



1. TOMASELLIA Mass. 



Thallus epiphloeodal, relatively well-developed. 1. T. exumana. 



Tliallus hypophloeodal. 



Spores over 30x12h. 2. T.macrospora. 



Spores under 25 X 10 «. 



Stroma with many ostioles indicated externally by 



whitened spots. 3. T. leucostoma. 



Stroma with few ostioles, concolorous with the black 



stroma. 4. T. cubana. 



1. Tomasellia exumana Riddle, sp. nov. 



Thallus epipUoeodes crustaceus uniformis effusus glaucus, crassiusculus, 

 undulatus laevigatua subnitidua rimulosus, linea nigra limitatus. Gonidia 

 chroolepoidea. Stromata 0.6-1.0 mm. lata, nigra nuda convexa vel hemisplierica 

 hand gibbosa, ambitu obtuse angulosa aut irregularia pauciostiolata, ostiolis 

 superficie aequalibus aut gibbosula inconspicuis. Perithecia crassa Integra 

 globosa. Paraphyses persistentes ramoso-eonnexae, Sporae in ascis biseriales, 

 inoolores ovoideae biloculares, loculo superiore multo majore, 14r-16 X 6-7 |ii. 



On bark near Georgetown, Great Exuma (Brttton and Millspaugh, February 22— 

 28, 1905, S1S5, type). 



The well-developed thallus and the strongly convex stromata are the best char- 

 acters for distinguishing this species. 



2. Tomasellia macrospora Eiddle, sp. nov. 



Thallus hypopMoeodes quasi halouem albidum formans aut evanesoens et 

 cum cortice maculam testaeeam constituens. Stromata 1.0-1.3 mm. lata, soli- 

 taria aut partim eonfluentia, deplanata vel leviter convexa peltata ambitu ro- 

 tundata, nigra thallino-pruinata aut denudata, ostiolis connatis papillata. Peri- 

 theeia Integra globosa. Paraphyses persistentes ramoso-eonnexae. Sporae 

 incolorea oblongae, 4-loeulares, loculis cylindrieis aequalibus, 30-38 X 12-li/i. 



On bark of Zanthoxylum flavum. Great E'xuma (Britton and Millspaugli, Feb- 

 ruary 22-28, 1905, SOm, type). 



Externally similar to Tomasellia cubana, but differing in the decidedly larger 

 spores, these measuring in the latter species only 15-25 x 5-9 «,. 



3. Tomasellia leucostdma Muell. Arg. Flora 68 : 257. 1885. 



On bark. Great Bahama, New Providence, Eleuthera, Exuma, Long Island : — 

 tropical America. 



The material listed under this and the following species shows considerable 

 variation and some of the specimens may be specifically distinct, but it has seemed 

 best to adopt a conservative treatment. 



4. Tomasellia cubana Muell. Arg. Bot. Jahrb. 6: 397. 1885. 



On bark. New Providence, Little San Salvador, Exuma, Cat Island, Conception 

 Island : — Cuba. 



