528 TRYPETHELIACEAE. 



5. Anthracothecium americanum (Ach.) Muell. Arg. Flora 68: 339. 1885. 

 Verrucaria analepta var. americana Ach. Lich. Univ. 275. 1810. 



On dead wood, Abaco, at Old Kerr's Point, and on bark of Drypetes diversifolia, 

 Thatch Cay, Long Island : Jamaica. 



Family 3. TRYPETHELIACEAE. 



Spores pluriloeular (two to many-celled). 

 Spores colorless. 



Spores with cylindrical cells. 1. Tomasellia. 



Spores with lens-shaped cells. 2. Trypethelium. 



Spores brown. 3. Melanotheca. 



Spores muriforni-multilocular, brown. 4. Bottaria. 



1. TOMASELLIA Mass. 



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



Thallus hypophloeodal. 



Spores over 30xl2. 2. T. macrospora. 



Spores under 25xl0. 



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 epiphloeodes erustaceus uniformis effusus glaueus, crassiusculus, 

 undulatus laevigatus subnitidus rimulosus, linea nigra limitatus. Gonidia 

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

 haud gibbosa, ambitu obtuse angulosa aut irregularia pauciostiolata, ostiolis 

 superficie aequalibus aut gibbosula inconspicuis. Perithecia crassa integra 

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

 incolores ovoideae biloculares, loculo superiore multo majore, 1416 X 6 7/x. 



On bark near Georgetown, Great Exuma (Britton and Millspaugh, February 22- 

 28, 1905, S135, type). 



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

 acters for distinguishing this species. 



2. Tomasellia macrospora Riddle, sp. nov. 



Thallus hypophloeodes quasi halonem albidum formans aut evanescens et 

 cum cortice maculam testaceam eonstituens. Stromata 1.0-1.3 mm. lata, soli- 

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

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

 thecia integra globosa. Paraphyses persistentes ramoso-connexae. Sporae 

 incolores oblongae, 4-loculares, loculis cylindricis aequalibus, 30-38 X 12-14 /a. 



On bark of Zanthoxylum flaviim, Great Exuma (Britton and Millspauph, Feb- 

 ruary 22-28, 1905, 3002, type). 



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

 spores, these measuring in the latter species only 15 25x5-9 ,. 



3. Tomasellia leucostoma 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. 



