532 ASTEOTHELIACEAE. 



acutae, 3-septatae, ad septa modiee constrictae, loculis lentiformibus, 18-22 

 X 8-9 M. 



On bark in coppice, West End, Great Bahama (Brace, April 16-May 8, 19O5, 

 3615, type). 



Parathelium microcarpum has smaller spores than any other species of the genus, 

 with the exception of P. decumbens 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 Kiddle, sp. nov. 



Thallus epiphloeodes crustaeeus uniformis effusus stramineo-albus subni- 

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

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

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

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

 Asci 2-G-spori. Sporae incolores oblongae medio leviter constricto irregulariter 

 rnnrali-divisae, 6-8-loculares, loculi 3 4-locellati, loculis cubicis aut irregu- 

 laribu?, 37-43 X 16-18 A*. * 



On bark of Drypetes, Cay North of Wide Opening, Exuma Chain (Britton and 

 J/i'77sptfH?/7i, February 18, 1905, 2795, tt/pc). 



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

 lower part of the perithecial wall. 



Family 6. ASTROTHELIACEAE. 



Spores colorless, plurllocular. 1. LithotJielium. 



Spores brown, muriform-multilocular. 2. Parmentaria. 



I. LITHOTHELIUM Muell. Arg. 

 1. Lithothelium bahamense Eiddle, sp. nov. 



Thallus epilithicus erustaceus uniformis effusus linea nigra limitatus, 

 glaucus aut cinereus opacus, crassiusculus crebre 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 nuclata, paucicarpica, ambitu oblonga aut satis dif- 

 formia, ostiolis minutis irregulariter umbonatis. Perithecia minutissima, 

 integra nigra. Paraphyses persistentes simplices fill formes. Asci cylindrices, 

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

 cylindricis, 18-22 X 5-6 A*. 



On limestone, vicinity of Cockburn Town, Watling's Island (Britton and Hills- 

 paiir/]>. March 13, 1907, 6^27,, type; 6129). 



Litliotlicliiim bahamense differs from the only other known species of the genus, 

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

 the eight-celled spores. 



2. PARMENTAKIA Fee. 



1. Parmentaria astroidea Fee, Es?ai Crypt. 70 3 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 hyperellus Ach. Lich. Suec. Prodr. 85. 1798. 



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

 and Europe. 



