432 I. DiscoLiCHENES (Wainio). [lioccella 



demum convexa et ssepe etiam immarginata, lateralia. Spora; 

 fusiformes, 3-septat£e, long. 0015 ad 0-021, crass. 0-0045 ad 0-005 

 mm., leviter curvatte, decolores, apicibus obtusis. Medulla jodo 

 •coerulescens. F. dichotoma Ach. secund. herb. Ach. apotheciis 

 sessilibus (non stipitatis) a f. suhpodiceUata differt. 



MossAMEDES. — Ad rupes Oceani Atlantici prope Cazimba (via 

 versus Cabo Negro). No. 406 pr. p. 



F. complanata Wain. 



Thallus longitudine circ. 15 ad 20 cm., ramis vetustioribus 

 circ. 4 ad 2 mm. latis, plus minusve compressis, ramis junioribus 

 anguloso-compressis, KHO non reagens, CaCLOg rubescens, esore- 

 diatus, rigidus. Medulla jodo cserulescens. Apothecia lateralia, 

 pruinosa, demum breviter stipitata. 



Moi^SAMEDEs. — Ad rupes Oceani Atlantici prope Cazimba (via versus 

 Cabo Negro). No. 406 pr. p. 



''Formam cylindricam et complanatam non raro eadem in rupe 

 inveni " (Welw. in sched.). 



2. R. Africana Wain., n. sp. 



Thallus elongatus, long. circ. 20 ad 25 cent., basin versus crass, 

 circ. 1-5 ad 2 mm., livido-pallescens, leviter pruinosus, KHO 

 rubescens, CaCloOo rubescens, esorediatus, rigidus, ramis omnibus 

 teretibus aut ad axillas plus minusve compressis dilatatisque. 

 Apothecia lateralia, basi constricta, demum ssepe subpodicellata, 

 marginata, disco planiusculo, pruinoso. Sporae long. circ. 0-024, 

 crass. 0-005 mm., rectse aut leviter curvatse, fusiformes, apicibus 

 acutis. Hymenium jodo non reagens aut passim levissime cserxi- 

 lescens. Medulla jodo cserulescens. 



Benguella. — ^Inter Roccellam ad portum Novo Rodondo advectam 

 legit A. Lopes de Silva. No. 405. 



Reactione thalli a R. thidoria et R. jjortentosa Mont, differt, a poste- 

 riore etiam apotheciis basi constrictis. In R. portentosa et R. duhiti 

 Darb. thallus neque KHO nee CaCloO^. reagens, medulla jodo cseru- 

 lescens. 



3. R. hypomecha (Ach.) Nyl. in Hue, Lich. Exot. p. 60 ; Darb., 

 Mon. E.0CC. p. 37. 



Var. isabellina Wain. 



Thallus esorediatus, opacus, teres, leviter pruinosus, pallescens 

 nut testaceus, neque KHO, nee CaCloOg reagens. 



Mossamedes.— Ad rupes maritimas loco dicto Cazimba inter Mossa- 

 medes et Porto Pinda parce et sterilis. No. 404. 



R. duhia Darb. et R. Canarion^is (Darb.) reactionibus solitis huic 

 variationi congruunt et habitu thalli parum ab ea differunt, at thallo 

 ■epruinoso ab ea distinguuntur. 



Var. Benguellensis (Welw.) Wain. 



Thallus esorediatus, albus, neque KHO, nee CaCl202 reagens. 



Mossamedes. — Ad rupes juxta Oceanum Atl. prope Cabo Negro. 

 No. 403. 



Apothecia demum sessilia, convexa, hemisphgerica, basi leviter con- 

 stricta, margine simplice thallode albido. Hypotheciuni fuscofuligi- 

 neum. Sporse long. 0-020 ad O'OIG, crass. 0-005 ad 00035 mm., rect« 



