Roccella] i. discoliciienes (Wainio). 43;; 



aut paroe curvatee. Thallus rigidus, vulgo teres, 1 ad 0'7 mm. crassus. 

 Medulla jodo cserulesoens. 



Ji. Gayana Mont. (Darb., I.e., p. 40) medulla jodo baud caerulescente 

 (thallus neque KHO nee CaCLPj reagens) a R. hypomecha differt. 



4. R. tnberculata Wain., sp. n. 



E. Canariensis Darb., Men. Eocc. p. 50 pr. p. (specimina 

 sorediosa). 



Thallus rigidus, long. 30 ad 80 mm., basin versus crass. 3 ad 

 0'7 mm., livido-albescens, pallescens aut fuscescens, epruinosus, 

 soraliis tuberculiformibus aut saltern margine elevatis instructus, 

 neque KHO, nee CaOl202 reagens, dichotome repetito-ramosus, 

 ramis teretibus. Medulla alba, jodo leviter caerulescens. 



Ins. Capitis Viridis.— Ad rupes in insula Fogo leg. Pharmaoop.. 

 Torres. No. 419. Ster. 



Var. Vincentina Wain. 



Thallo passim leviter pruinoso et soraliis CaOl203 rubentibus a 

 R. tuberculata differt, at forsan non est autonoma species. Cete- 

 rum thallus neque KHO.. nee CaOl202 reagens. Medulla alba, 

 jodo cjerulescens. Soralia elevata. 



Ins. Capitis Vieidis. — Hinc inde ad rupes maritimas insulse S. 

 Vincentii. No. 402 pr. p. 



5. R. Mossamedana Wain., sp. n. 



Thallus livido-pallescens aut albidus, soraliis cinereis, baud aut 

 vix elevatis instructus, KHO rubescens, CaCl202 non reagens,, 

 rigidus, long. circ. 25 ad 30 mm., basin versus crass, circ. 0'5 ad 

 0'7 mm., crebre dichotome repetito-ramosus, ramis teretibus. 

 Medulla alba, jodo baud reagens. 



MossAMEDES. — Ad rupes in summis jugis Serra de Montes Negros. 

 No. 418. Ster. 



6. R. Arnoldi Wain. 



R. tinctoria Darb., I.e., p. 32 pr. p. (specimina sorediosa) ; Arn., 

 Lich. Exs. n. 1689. 



Thallus rigidus, ramis teretiusculis, passim levissime pruinosus, 

 sorediosus, glaucescens aut fuscescens, KHO non reagens, CaOl202 

 rubescens, etiam soralia CaCl302 rubescentia. Medulla basis et 

 placentse alba, jodo caerulescens. Habitu similis est R. fucoidi 

 (Dicks.) Wain. {Lichen fucoides Dicks., Crypt. Pasc. ii. 1790, 

 p. 22, secund. specim. authent. in herb. Ach. ad R. phycopsin 

 Darb. vel R. phycopsin Ach., Lich. Univ. 1810, p. 440 pr. p., 

 spectat), at colore meduUse placentae ab ea differt, reactionibus, 

 KHO, CaCl202 et jodo productis, cum ea congruens. In R. diffidli 

 Darb., I.e., p. 49, thallus KHO non reagens, CaCl202 leviter 

 rubescens, soralia CaCl202 non reagentia, medulla jodo cserulescens. 

 In R. Caribcea Darb., I.e., p. 53, thallus neque KHO nee OaCljOs 

 reagens, soralia OaCl202 rubescentia, medulla jodo caerulescens. 

 R. Arnoldi tantum sterilis est cognita, at saltem thallo soredioso 

 a R. tinctoria differt. In Roccellis, sicut in speciebus plurimis. 

 lichenum, prsesentia et absentia soralium nota est valde constans^ 



