TRYPETHELIACEAE. 



529 



2. TRYPETHELIUM Spreng. 



Spores four-celled. 



Spores over 35 u in length. 

 Spores under 30 « in length. 

 Stroma darlr brown to black. 



Stroma little developed, the Individual perl- 



thecia evident. 

 Stroma well-developed, merely the tips of the 

 perltheeia showing. 

 Stroma some other color. 

 Thallus rusty-orange. 



Stroma flat and covered by the thallus. 

 Stroma elevated, conical. 

 Thallus some other color. 



Stroma irregularly linear-elongated, peri- 

 thecla often showing a serial arrange- 

 ment. 

 Stroma rounded, oval, or oblong. 



Stroma elevated, the black tips of the 



perithecia conspicuous. 

 Stroma depressed, the tips of the peri- 

 thecia inconspicuous. 

 Spores six to many-celled> 

 Stroma yellow within. 



Thallus smooth, stroma neither yellow nor pow- 

 dery externally. 

 Stroma varying in color from ashy to fulvous 



or chestnut-brown, strongly convex. • 

 Stroma dark-brown or blackening, flattened. 

 Thallus smooth or powdery, stroma yellow or 

 powdery or both. 

 Thallus smooth, stroma lemon-yellow and 



powdery. 

 Both thallus and stroma covered with a sul- 

 phury or aeruginous powder. 

 Stroma becoming brown or black within. 



1. Trypethelium ochroth&lium Nyl. Act. Soc. Sci. Eenn. 7: 494. 1863. 



On bark, The Bight, Cat Island : — Isle of Pines, Cuba ; Colombia. 



2. Trypethelium troficum (Ach.) Muell. Arg. Bot. Jahrb. 6: 393. 1885. 



Verrucaria tropica Ach. Lich. TFniv. 278. 1810. 

 Pyrenula tropica Tuck. Genera Lieh. 273. 1872. 



On bark of various species, Andros, New Providence, Cat Island, Long Island : — 

 widely distributed in tropical and subtropical regions of both hemispheres. 



3. Trypethelium mastoideum Ach. Lich. Univ. 307. 1810. 



Bathelium mastoideum Ach. Meth. Lich. 111. 1803. 



Trypethelium scoria Nyl. Expos. Pyren. 74 . 1858. Not F^e Essai Crypt. 

 69. 1824. 



On bark. New Providence and Bleuthera : — ^widely distributed in tropical and 

 subtropical regions of both hemispheres. 



4. Trypethelium afenenm (Eschw.) Zahlbr. in Engler and Prantl, Nat. Pflan- 



zenfam. 1" : 70. 1903. 



Verrucaria aenea Eschw. in Mart. n. Bras. 1: 133. 1833. 

 Trypethelium Kumei Fee, Ann. Sci. Nat. I: 23: 446, pi. 15, f. 3. 

 Trypethelium heteroehroum Tuck. Genera Lich. 260. 1872. 



1831. 



On bark, Andros, near NichoH's Town ; Crooked Island, at Landrail Point ; Ack- 

 lin's Island, at Boathouse Cove : — Florida ; Cuba ; Costa Kica ; Brazil. 



5. Trypethelium ferrugineum Muell. Arg. Bot. Jahrb. 6: 392. 1885. 

 On bark, Andros, at Deep Creek : — Cuba. 



