COLLECTED AT THE CAPE OF GOOD HOPE. 179 



On stones, generally on the underside; sparingly gathered, though 

 what seems to be the barren thallus is more frequent. 



Lecidea distr'ata, Nyl., sp. n. Thallus albus vel albidus, tenuis, 

 plano-areolatus vel areolato-diffractus (rimis nigris), K-f (flavens), I 

 hypothallo nigro subsparse instratus ; apothecia nigra, innata, plana, 

 subraarginata (latit. 0'2-0*4 millim.), juniora margine thalhno obso- 

 leto cincta ; sporae 8nae, fuscae, 1-septatsc, longit. 0014-0019 millim., 

 crassit. 0*007-0009 millim. ; epithecium fuscum ; paraphyses medio- 

 (non semper bene discrete) ; hypothecium incolor. Iodo gelatina 

 hymenialis intensive et persistenter caerulescens. 



Forsan in stirpe L. spuria locum habet ; pertinet ad species illas quae 

 ambigunt inter Lecideas et Lecanoras. Conferenda est Lecanora 

 confragosula. 



On rocks (quartzose) ; very sparingly gathered. 



L. minutula (Hepp.). 



On rocks ; generally associated with other lichens, apparently common. 



L. subtristis, Nyl., sp. n. Thallus fuscus, tenuissimus, laevigatas, ri- 

 mulosus; apothecia nigra, plana, marginata (latit. 0*5-0 # 7 millim.), 

 intus albida; sporae 8nae, fuscae, biloculares, longit. 0*0 1 6-0*020 mil- 

 lim., crassit. O'009-O'Oll millim.; paraphyses mediocres, clava fusca ; 

 hypothecium incolor. Iodo gelatina hymenialis bene caerulescens. 



In consequence of the spermogones not being visible, it is not 

 certain whether this species be in reality a Lecidea belonging to 

 L. coniops or rather a Lecanora of the section of L. coniopta. 



On rocks (quartzose) ; very sparingly gathered. 



L. myriocarpa, f. marcidula, Nyl. Thallo pallido evanescentc, 

 sporis longit. O'OlO-OOll millim., crassit. 0'004-0*006 millim., para- 

 physibus non bene discretis. 



Perhaps a distinct species — though, as the spermogones are not 

 present, this is not certain. 



On rocks, associated with other lichens. 



L. GEOGRAPHICA (L.). 



On rocks (quartzose) near the summit, very sparingly gathered. 



Tribe Graphidei. 



Opegrapha parvula, Nyl., sp. n, Thallus cinerascens, obsoletus ; 

 apothecia nigra, minuta, rotundata vel oblongo-rotundata (latit. circiter 

 0*2 millim.), epithecio impresso ; sporae 8nae, incolores, fusiformes, 

 3-septatae, longit. 0022-0027 millim., crassit. 0003 millim.; para- 

 physes mediocres; epithecium luteo-fuscescens ; hypothecium cum 

 perithecio nigrum. Iodo gelatina hymenialis vinose rubens (praece* 

 dente caerulescentia). 



