COLLECTED AT THE CAPE OF GOOD HOPE. 175 



Lich. Cap. p. 78, t. viii. fig. 1-18 (excl. spermogoniis, quae sanealiena), 

 sed thecae bisporae (sporae longit. 0*060-0*070 millim., crassit. 0*038- 

 0*048 millim.). Iodo gelatina hymenialis caerulescens, dein thecae 

 vinose rubentes. 



Thallus K+, flavens, dein cinnabarino-rubens. Apothecia incoloria. 

 Spermatia bacilliformia vel bacillari-fusiformia, longit. 0*006-0*008 

 millim., crassit. 0*0008 millim. 



On rocks ; probably not uncommon. 



Pertusaria subdealbata, Nyl., sp. n. Thallus albidus, conferte 

 areolato-rimosus (crassit. circiter 0*5 millim. vel tenuior) ; apothecia 

 nigricantia (in protuberantiis thalli convexis subdifformibus innata, 

 singulum in quavis protuberantia), stratum sectione nigricans tenue 

 (latit. 1 millim. vel minoris, crassit. vix 0*2 millim. in sicco statu) exhi- 

 bentia ; sporae 2nae, longit. 0*046-0*056 millim., crassit. O'OlS-0'022 

 millim. Iodo gelatina hymenialis caerulescens, deinde thecae vinose 

 rubescentes. Spermatia recta, longit. 0005 millim., crassit. 0*0005- 

 0*0006 millim. 



From P. Wawreanoides, to which it approaches, it is distin- 

 guished by the different character of the apothecia and the thalline 

 protuberances, as also by the smaller spores. The reaction of 

 the thallus is the same in both, viz. K+, from yellow becoming 

 saffron-ferruginous. 



On rocks ; apparently rare. 



P. vepallida, Nyl., sp. n. Thallus pallido-albidus, tenuis, laevigatas, 

 areolato-rimosus ; apothecia nigricantia, innata, plana, sublecanorina, 



difformia, subpruinosa, minuta (latit. vulgo 0*2-0*3 millim.), margine 

 thallino parum vel vix prominulo (1-3 in quavis areola thallina fer- 

 tili) ; sporae 8nae, longit. 0-027-0*037 millim., crassit. 0016-0021 

 millim. Iodo gelatina hymenialis caerulescens, thecae praesertim 

 tinctae. Spermatia recta, longit. 0*016-0*018 millim., crassit. 0*0005 

 millim. 



This species is allied to P. rubescens (Tayl.) ; but this latter has 

 the thallus somewhat thicker, rugose, the spores larger, &c. 



On rocks ; very sparingly gathered. 



P. L.EIOPLACA, f. OCTOSPORA, Nyl. 



On the bark of trees, associated with other lichens ; very sparingly 

 gathered, but probably common. 



Tribe Thelotremei. 



Urcrolaria dicuteria, Nyl. Lich. St. Paul, p. 6. 

 On the ground ; probably common. 



U. subcuprea, Nyl. 9 sp. n. Thallus lurido-fuscescens vel subcupreus, 



LTNN. JOURN. — BOTANY, VOL. XV. P 



