LICHENES IN INSULA TRINIDAD. 141 



quae apotheciis crebris, epithecio obscurato et sporis majoribus ab 

 ea recedit. Gr. affinissima et Gr. tetraphora Nyl. habitu ab ea magis 

 differunt. 



Ad corticem arboris. Maraval Valley (No. 94). 



38. Graphis exsolvens Vain. (sp. n.). Thallus modice incrassa- 

 tus aut sat tenuis, sat laevigatus, glaucescens aut ad ambitum partim 

 subroseus, opacus, nee KOH nee jodo reagens, fragilis, inferne strato 

 hypothallino tenui, nigro crebre contexto, totus obductus, demum 

 substrato saltern passim laxe adhaerens. Apothecia subdendroideo- 

 aggregata aut dispersa, elongata aut brevia, long. 7-0.5, lat. 0.55-0.3 

 mm., dichotome ramosa aut simplicia, leviter prominentia, margine 

 modice incrassato, KOH demum leviter subfulvescente. Perithecium 

 album, labiis apertis, amphithecio thallino obductis, latere praerupto. 

 Discus apertus, leviter impressus, planus, livido-pallescens, pruinosus. 

 Hymenium jodo dilutissime caerulescens. Epithecium dilute oliva- 

 ceum. Sporae solitariae, decoloratae, jodo caerulescentes, murali- 

 divisae, cellulis numerosissimis, long. circ. 0.120, crass. 0.040-0.050 

 mm., membrana haud gelatinosa. 



Habitu subsimilis Gr. fissurinoideae (Nyl.) Vain. (Fl. Koh Chang, 

 p. 360), quae thallo jodo caerulescente ab ea differt. 

 Ad ramos arborum. Maraval Valley (No. 14). 



39. Graphis collosporella Vain. (sp. n.). Thallus tenuis, laevi- 

 gatus, albido-glaucescens aut cinerascenti-albidus, KOH lutescens 

 deindeque fulvescens aut aurantiaco-subfulvescens arete adnatus, 

 linea hypothallina nigricante limitatus. Apothecia sat crebra, long. 

 2.2-0.4, lat. 0.25-0.3 (-0.5) mm., leviter curvata fluxuosave, simplicia 

 aut raro furcata, leviter prominentia, margine sat tenui, KOH lutes- 

 cente deindeque aurantiaco-subrubescente. Perithecium album, labiis 

 demum apertis, amphithecio thallino obductis, basim versus sensim 

 dilatatis aut demum sat praeruptis. Discus demum apertus, angus- 

 tus, lat. 0.15-0.2 mm., planus, leviter impressus, livido-pallescens, 

 tenuiter pruinosus. Hymenium jodo dilute caerulescens. Epithe- 

 cium impure pallidum. Sporae 4:nae aut binae, decoloratae, jodo 

 caerulescentes, murali-divisae, cellulis numerosissimis, long. 0.050- 

 0.062, crass. 0.014-0.020 mm., strato gelatinoso tenui aut sat crasso 

 vulgo indutae. 



Affinis G. collosporae Vain. (Addit. Lich. Antill. p. 153). 

 Ad corticem arborum. Maraval Valley (Nos. 9-10). La Seiva 

 Valley (No. 97). 



