356 Transactions, — Botany. 



Art. LIII. — Descrijption of some New Zealand Liclieiis. 

 By Charles Knight, F.R.C.S., F.L.S. 



Plate XXIII. 

 {Read before the Wellington Philosophical Society, 2ist November, 1874.] 



1. Pldyctis egentior, Nyl. 



Thallus tenuissimus, livido-cineraceus, sat determinatus. Apothecia innata 

 parva flavo-fusca rotundata aut diflformia, margine thallino pulverulento cincta, 

 disco piano brunneo ssepius pulverulento. Sporce incolores falcatse 7-9-septat89, 

 longit. 0-062 mm., crassit. 0*007 mm. 



Ad cortices arborum. 



Thallus very thin, livido-cineraceous, somewhat determinate. Apothecia 

 innate, small, yellowish-brown, rounded or misshaped, bound by a powdery 

 thalline margin. Spores colourless, falcate, 7-9-septate, length 0*062 mm., 

 breadth 0*007 mm. 



Differs from Phlyctis andennis and P. hrasiloisis in the colour of the 

 thallus, and probably, by the powdery thalline margin with which the 

 apothecia are bound. 



2. Phlyctis neo-zelandia, Nyl. 



Thallus crustaceus, uniformis, albus, tenuis vel crassus, late expansus, 

 rimosus, determinatus. Apothecia minuta, innata, maculiformi-difformia, 

 concaviuscula, carnea, excipulo proprio nullo — nisi margine thallino spurio 

 extus pulverulento — cincta. Sporce incolores, vermiformi-cylandracese, spiraliter 

 curvatse, 7-ll-septat8e, longit. 0*07 mm., crassit. 0-005 mm. 



Ad corticem arborum. 



Thallus crustaceous, uniform, white, thin or thick, widely expanded, 

 rimose, determinate. Apothecia minute, innate, concave, flesh-coloured, without 

 a proper excipulura, surrounded by a pulverulent thalline margin. Spores 

 colourless, spirally curved, 7-11-septate, 0-07 millim. long., 0'005 millim. 

 thick. 



On bark. 



3. Lecidea stelhdata, Taylor. 



Thallus albidus, tenuissimus, areolato-dilfractus, hypothallo nigro manifesto 

 inter areolas. A2)othecia sessilia, nigra. /Sporce fuscce vel nigraj, uni-septatte, 

 longit. 0-01 mm., crassit. 0*006 mm. 



Ad saxa. 



Thallus white, very thin, areolatc-diffractate, hypothallus black, visible 

 between the areola). Apothecia sessile, black. Spores brown or black, 

 1-aeptatc, 0*01 millim. long., 0*006 millim. thick. 



On rocks. 



