166 TRANSACTIONS OF THE 



nigris (K flavo-dissolutis) ; liypotliecium fusco-nigrum. lodo gel. 

 hym. intense coerulescens. 



Ad cortices prope Port of Spain. 



Lecidea remensa, sp. nov, 



Thallus glaucus vel glauco-virescens crassiusculus, rugulosus vel 

 potias sqnamiiloso-concretus nigro-limitatus (K — C — ), medulla 

 alba (K fl. dein rubente) ; apothecia adnata nigra parva (latit. 

 •3 - -4 mm.) marginata dein convexula et immarginata ; sporse 

 Snse tuscse ellipsoidese l-septatse, -012 -'015 X -006 - -007 mm.; 

 paraphyses graciles non bene discretse pellucidse vel pallidas fusco- 

 clavatse ; hypothecium fuscum. lodo gel. hym. intense coerulescens 

 fere nigra. 



Ad cortices. 



This lichen presents, on the one hand, affinities to L. glauco- 

 nigella, and, on the other, to the genus Pyxine, the barren thallus 

 of a species of which is often seen contiguous to it. 



Platygrapha psaroleucoides, sp. nov. 



Thallus albido-glaucescens vel pallidus, crassiusculus, rimuloso- 

 areolatus nonnihil rugulosus et farinaceus nigro-limitatus (K — , 

 C erythrinosus) ; apothecia lecanorina albido-suffusa, prominula, 

 plana, rotundata vel nonnihil irregularia, margine distincto discisso 

 Isevigato cincta (latit. -5 -1-0 mm.); sporse Snse in thecis pyri- 

 formibus arthonioideis, incolores obtuse fusiformes ssepe curvulse 

 3-septatse, -024 — -032 x -005— -007 mui. ; paraphyses distinctse 

 filiformes divaricato-ramosse nonnihil irregulares, apicibus inco- 

 loribus non-clavatis : hypothecium crassum fusco-nigrum (in lamina 

 tenui visum). lodo gel. hym. vinose rubescens. 



Ad cortices Iseves. 



This curious lichen has a close affinity to PI. psaroleuca, but 

 differs, inter alia, in the much shorter and thicker spores. 



Platygrapha punctella, sp. nov. 



Thallus chrysogonidicus albidus tenuis nonnihil rimuloso-areo- 

 latus, ssepius interruptus aut dispersus ; apothecia in verrucis 

 depressiusculis immersa, nigra punctiformia, ssepius seriatim dis- 

 posita vel collabentes; sporse incolores fusiformes ssepe curvulse 

 3-5-septat8e (septulis valde indistinctis), -028 — -04 x -0035 — 

 •0045 mm.; paraphyses satis bene distinctse irregulares, apicibus 



