532 ASTEOTHELIACEAE. 



aciitae, 3-septatae, ad septa modice constrictae, loeulis lentifomiibus 18-''2 

 X 8-9 M. 



On bark in coppice, West End, Great Bahama (Brace, April 16-Mav 8 1905 

 8615, type). ' 



Parathelium microcarpum has smaller spores than any other species of the eenus 

 with the exception of P. decumhens Muell. Arg. (Hedwigia 32: 134. 1893) which 

 differs from the present species in the whitish thallus and the larger perithecia. 



2. CAMPYLOTHELIUM Muell. Arg. 



1. Campylothelium decolorans Eiddle, sp. nov. 



Thallus epiphloeodes crustaceus uniformis effusus stramineo-albus subni- 

 tidus, tenuis vel tenuissimus, continuus laevigatus inaequalis. Gonidia chroole- 

 poidea. Perithecia circa 1.0 mm. lata, tota thallino-corticata parum promi- 

 nentia, quasi maculam fuscescentem formantia, superne nigra, inferne decol- 

 orata, ostiolis lateralibus collis nullis. Paraphyses persistentes satis ramosae. 

 Asci 2-6-spori. Sporae incolores oblongae medio leviter constrieto irregulariter 

 murali-divisae, 6-8-loeulares, loculi 3-4-locellati, loeulis cubicis aut irregu- 

 laribus, 37-43 X 16-18 fi. 



On bark of Dri/petes. Cay North of Wide Opening, Exuma Chain (Britton and 

 MiUspavgh, February 18, 1905, 2795, type). 



This species differs from other species of the genus in the pale color of the 

 lower part of the perithecia! wall. 



Family 6. ASTEOTHELIACEAE. 



Spores colorless, plurilocular. 1. Lithothelium. 



Spores brown, muriform-mnltilocular. 2. Parmentaria. 



1. LITHOTHELIUM Muell. Arg. 



1. Lithothelium bahamense Eiddle, sp. nov. 



Thallus epilithicus crustaceus uniformis effusus linea nigra limitatus, 

 glaucus aut cinereus opacus, crassiusculus erebre contextus, continuus laevi- 

 gatus. Gonidia chroolepoidea. Stromata minuta, 0.4-0.6 mm. lata, in foveolis 

 saxi innata, dein semi-emergentia; demum elabentia foveolamque relinquentia, 

 tota nigra parte emersa nudata, paucicarpiea, ambitu oblonga aut satis dif- 

 formia, ostiolis minutis irregulariter umbonatis. Perithecia minutissima, 

 Integra nigra. Paraphyses persistentes simplices filiformes. Asci cylindrices, 

 8-spori. Sporae in ascis 1-2-seriales, incolores, fusiformes, 8-loculares, loeulis 

 eylindricis, 18-22 X 5-6 At. 



On limestone, vicinity of Cockburn Town, Watling's Island {Britton and Mills- 

 paugh, March 13, 1907, GUH, type: 6129). 



LithotheJium hahamruse differs from the onlv other known species of the genus, 

 L. cuhanum Muell. Arg. (Bot. Jahrb. 6: 386. 1885), in the color of the thallus and 

 the eight-celled spores. 



2. PARMENTARIA Fee. 



1. Parmentaria astroidea Fee, Es?ai Crypt. 70, pi. 20, f. 1. 1824. 



On bark. New Providence, at Clifton Coppice, and Crooked Island, at Vauxhall : — 

 widely distributed in tropical and subtropical regions. 



Order 2. CALICIALES. 

 Family 1. CALICIACEAE. 



1. CALICIUM Pers. 



1. Calicium hyperellum Ach. Meth. Lich. 93. 1803. 



Lichen liyperellus Ach. Lich. Suec. Prodr. 85. 1798. 



On palmetto, The Bight, Cat Island : — widely distributed in North America 

 and Europe, 



