GEAPHIDACEAE. 535 



6. Opegrapha isabellina Eiddle, sp. eov. 



Thallus erustaoeus uniformis effusus haud limitatus, isabellinus minute 

 albo-maculatus, tenuis continuus laevigatus. Gonidia chroolepoidea. Apotheeia 

 dispersa aut rarius aggregata superficialia elevata, simplieia recta aut rarius 

 flexuosa, oblonga aut linearia, 0.8-2.0 mm. longa, 0.1-0.2 mm. lata, tota nigra, 

 labiis haud suloatis eonniventibus disco rimaeformi; amphithecio nigrieante 

 integro basi completo. Paraphyses ramosae. Asci clavati, 8-spori. Sporae 

 ineolores, fusiformes, 6-8-loculares loculis eylindricis aequalibus, 20-24 X 4-5 |Ci. 



On limestone, New Providence (Brace, May 20, 1918, 9437, type) . In the Tucker- 

 man Herbarium there is an unnamed specimen of this species from Cuba, sent to 

 Tuckerman> by Ravenel. 



Scarcely anything is known of the rock-inhabiting Opegraphas of the tropics. I 

 have been unable to find any described in the writings of Nylander, Mueller-Argau, 

 or Wainio. The three new species here described appear to be distinct from the 

 E/uropean species. 



7. Opegrapha bahamfesis Eiddle, sp. nov. 



Thallus crustaceus uniformis eflfusus haud limitatus, testaceus, sat eras- 

 siusculus laevigatus aut rugulosus, rimulosus partim areolatus, sorediis nullis; 

 hypothallo nuUo. Gonidia ohroolepoidea. Apotheeia dispersa aut rarius aggre- 

 gata, primum subinnata mox superficialia elevataque, simplieia recta, pro 

 maxima parte brevia oblonga, 0.4-0.7 mm. longa, rarius subelongata, ad 1.5 

 mm. longa, 0.1-0.2 mm. lata, tota nigra, labiis haud sulcatis eonniventibus aut 

 rarius hiantibus, disco rimaeformi aut rarius paullum aperto; amphithecio 

 fusco-nigricante integro basi completo. Paraphyses sparse ramosae. Asci 

 elavati, S-spori. Sporae ineolores fusiformes, 6-loeulares loeuli eylindricis 

 aequalibus, 18-20 X 3-4 fi. 



On limestone, New Providence (Brai;e, June 5, 1918, O^Sia, type). 



Opegrapha iahamensis resembles 0. ChevalUeri var. incarnata Eiddle (Bull. 

 Torrey Bot. Club 43 : 150. 1&16), but differs in the six-celled spores. From O. xonata 

 Koerb., it differs in the absence of soredia and hypothallus. The key-characters will 

 serve to distinguish it from O. isaielUna. 



8. Opegrapha columbina Eiddle, sp. nov. 



Thallus crustaceus uniformis effusus haud limitatus, eolumbina aut 

 plumbeus aut partim nigrescens, tenuissimus farinulentus. Gonidia chroole- 

 poidea. Apotheeia dispersa aut conglomerato-approximata, superficialia ele- 

 vata, simplieia recta oblonga, 0.5-1.5 mm. longa, circa 0.2 mm. lata, tota nigra, 

 labiis haud sulcatis eonniventibus disco rimaeformi; amphithecio nigrieante 

 integro basi completo crasso. Paraphyses ramosae. Asci clavati, 8-spori. 

 Sporae ineolores fusiformes, 8-loeulares loculis eylindricis aequalibus, 24-28 

 X 5-7 /i. 



On limestone, vicinity of Governor's Harbor, Bleuthera Island (Britton and 

 Millspaugh, February 19-20, 1907, 5533, type). 



This species is most closely related to Opegrapha ophites Tuck, (apud Eiddle in 

 Bull. Torrey Bot. Club 43: 150. 1916), but differs in the short, straight, oblong 

 apotheeia. From O. Uthyrga Ach. it may be distinguished by the color of the thallus 

 and the wider spores. 



2. GBAPHIS Adans. 



Apotheeia externally black. 



Apotheeia 0.4—1.0 mm. in length. 1. O. Pavoniana. 



Apotheeia mostly 2—5 mm. in length. 2. O. scripta. 



Apotheeia not externally black. 



Apotheeia white, contrasting with the dark thallus or bark. 3. G. Afeelii. 

 Apotheeia concolorous with the glaucous thallus. 



I/ips entire or nearly so. 4. G. vestita. 



Lips deeply sulcate. 5. G. cinerea. 



1. Graphis Pavoiiia,na Fee, Essai Crypt. 40. 1824. 

 On bark. New Providence : — Texas ; Bermuda. 



