532 ASTROTHELIACEAE. 



acutae, 3-septatae, ad septa modice constrictae, loeulis lentiformibus, 18-22 

 X 8-9 m. 



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

 S615, type). 



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

 with the exception of P. decumbens Muell. Arg. (Hedwigia 32: 134. 1803) which 

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



2. CAMPYLOTHELIUM Muell. Arg. 

 1. Campylothelium decolorans Riddle, sp. now 



Thallus epiphloeodes crustaceus uniformis effusus stramineo-albus subni- 

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

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

 nentia;, quasi maculam fnseescentem formantia, superne nigra, inferne decol- 

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

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

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

 laris, 37-43 X 16-18 p.. 



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

 MilUpaugh, February 18, 1905, 279.5, type). 



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, plurilocular. 1. Lithothelium. 



Spores brown, muriform-multilocular. 2. Parmentaria. 



1. LITHOTHELIUM Muell. Arg. 



1. Lithothelium bahamense Riddle, sp. nov. 



Thallus epilithieus crustaceus uniformis effusus linea nigra limitatus, 

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

 formia, ostiolis minutis irregulariter umbonatis. Perithecia minutissima, 

 integra nigra. Paraphyses persistentes simplices filiformes. Asci cylindriees, 

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

 eylindricis, 18-22 X 5-6 p.. 



On limestone, vicinitv of Cockburn Town, Watling's Island (Britton and Mills- 

 paugh, March 13, 1907. 6127, type; 6129). 



Lithothelium bahamenfte differs from the only other known species of. the genus, 

 L. cubanum 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, Essai 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 hyperellus Ach. Lich. Suec. Prodr. 85. 1798. 



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

 and Europe. 



