132 i. discolichenes (Wainio). [Iioccella 
<lemum convexa et sa?pe etiam immarginata, lateralia. 8pora> 
fusiformes, 3-septatse, long. 0015 ad 0-021, crass. 0-0045 ad 0-000 
mm., leviter curvatse, decolores, apicibus obtusis. Medulla jodo 
cserulescens. F. dichotoma Ach. secund. herb. Ach. apothcciis 
sessilibus (non stipitatis) a f. subpodicellata 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, CaCl 2 2 rubescens, esore- 
diatus, rigidus. Medulla jodo cserulescens. Apotbecia lateralia. 
pruinosa, demum breviter stipitata. 
MOSSAMEDES. — 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, CaCl 2 2 rubescens, esorediatus, rigidus, ramis omnibus 
teretibus aut ad axillas plus minusve compressis dilatatisque. 
Apotbecia lateralia, basi constricta, demum ssepe subpodicellata, 
marginata, disco planiusculo, pruinoso. Sporse long. circ. 0*024, 
crass. 0005 mm., rectse aut leviter curvatse, fusiformes, apicibus 
a cutis. Hymenium jodo non reagens aut passim levissime cseru- 
lescens. Medulla jodo cserulescens. 
Benguella. — Inter Roccellam ad portum Novo Rodondo advectam 
legit A. Lopes de Silva. No. 405. 
Reactione thalli a R. tinctoria et R. portentosa Mont, differt, a poste- 
riore etiam apotheciis basi constrictis. In R. portentosa et R. dubia 
Darb. thallus neque KHO nee CaCl.XK reagens, medulla jodo cseru- 
lescens. 
3. R. hypomecha (Ach.) Nyl. in Hue, Lich. Exot. p. 60 ; Darb., 
Mon. Rocc. p. 37. 
Var. isabellina Wain. 
Thallus esorediatus, opacus, teres, leviter pruinosus, pallescens 
aut testaceus, neque KHO, nee CaCL0 2 reagens. 
MOSSAMEDES. — Ad rupes maritimas loco dicto Cazimba inter Mossa- 
medes et Porto Pinda parce et sterilis. No. 404. 
R. dubia Darb. et R. Ccmariewis (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 Ca01 2 2 reagens. 
MOSSAMEDES. — Ad rupes juxta Oceanum Atl. prope Cabo Negro. 
No. 403. 
Apothecia demum sessilia, convexa, hemisphajrica, basi leviter con- 
stricta, margine simplice thallode albido. Hypothecium fuscofuligi- 
neum. Spora? long. 0-020 ad 0-01G, crass. 0-005 ad 00035 mm., recta; 
