538 CHIODEOTONACEAE. 



5. Chiodecton crassmn (DC.) Zahlbr. in Engler and Prantl, Nat. Pflanzenfam. 



1'*: 104. 1905. 

 Opegrapha crassa DC. El. Fl^anc. 2: 312. 1805. 



On bark, New" Providence, at Maidenhead Coppice : — Europe ; northern Airica ; 

 Japan. Not previously recorded from North America. 



6. Chiodecton Br^cei Riddle, sp. nov. 



Thallus epilithicus erustaceus uniformis subdeterminatus maculas 3-15 

 mm. diam. formans haud linea nigra limitatus, argillaceus aut albus, in cras- 

 situdine mediocris, crebre contextus continuus laevigatus undulatus. Gonidia 

 ehroolepoidea. .Stroma nulla. Apotheoia dispersa aut rarius aggregata thallo 

 immersa punctiformes aut difformia aut partim elongata, 0.1-0.5 mm. longa, 

 simplicia, disoo sicco nigro madefacto badio, nudo piano superfieiem thaUo 

 subaequante, margine tenuissime spurie thallino aut margine evanescente; epi- 

 tlieoio fuscescente; hymenio et hypothecio incolore. Paraphyses erasaiusoulae 

 ramoso-connexae. Asei .clavati 8-spori. Sporae incolores fusiformes 4-loculares 

 loeulis cylindrieis aequalibus, 14^20 X 4/u.. 



On limestone, New Providence (Brace, June 16, 1918, 951S, type). Also, Wat- 

 ling's Island, vicinity of Cockburn Town (Britton and Millspaugh. 6128a). 



Chiodecton Bracei belongs to the section Enterographa. It differs from C. rufes- 

 cens Wainio (Journ, Bot. 34: 2'62. 1896) in having simple apothecia which are more 

 often punctate or difform than elongated. I take pleasure in naming this species in 

 honor of Mr. Brace, whose collections have greatly extended our knowledge of the 

 lichens of the Bahamas. 



2. SCSLEROPHYTON Esohw. 



1. Sclerophyton elegans Esehw. in Mart. Fl. Bras. 1: 103. 1833. 



Stigmatidium elegans Nyl. Bull. Soe. Linn. Norm. II: 3: 274. 1869. 



On bark. New Providence, along Soldier's Road : — Florida ; Bermuda ; Cuba ; 

 Guadeloupe ; Brazil. 



Easily confused with species of Arthonia, as the stroma is by no means obvious. 



3. GLYPHIS Ach. 



1. Crlyphis cicatricosa Ach. Syn. Lieh. 107. 1814. 



Glyphis Aahariana Tuck. Amer. Journ. Sci. 25: 429. 1858. 



On bark of various species, and at various localities. Great Bahama, New Provi- 

 dence, Watling's Island : — one of the commonest of tropical lichens. 



4. SAROOGEAPHA F«e. 



1. Sarcographa tricosa (Ach.) Muell. Arg. Mem. Soc. Phys. Hist. Nat. Geneve 

 29»: 63. 1887. 



Graphis tricosa Ach. Lieh. Univ. 674. 1810. 



On bark, New Providence, and Long Island : — widely distributed in tropical re- 

 gions of both hemispheres. 



Tamily 4. DIRINACEAE. 



1. DIRINA Fr. 



Growing on rocks. 1. D. repanda. 



Growing on bark (of JacQuinia keyensis). 2. D. ceratoniae, 



1. Dirina repanda (Fr.) Nyl. Act. Soc. Linn. Bordeaux 21: 343. 1866. 

 Farmelia repanda Fries, Lieh. Europ. 177. 1831. 



On limestone. New Providence, near Queen's Staircase, Nassau ; Great Exuma, 

 along Haynes Road ; Long Cay, on Cunningham Hill : — southern Europe and northern 

 Africa, Hawaii, India. The occurrence in the Bahamas of this species, not previously 

 known from North America, was recorded in the Bryologlst (21: 50. 191S). 



