Monographs Details: Opegrapha bahamensis Riddle
Authority: Britton, Nathaniel L. & Millspaugh, Charles F. 1920. The Bahama Flora.
Family:Roccellaceae
Description:Species Description - Thallus crustaceus uniformis effusus haud limitatus, testaceus, sat crassiusculus laevigatus aut rugulosus, rimulosus partim areolatus, sorediis nullis; hypothallo nullo. Gonidia chroolepoidea. Apotheeia dispersa aut rarius aggregata, primum subinnata mox superficialia elevataque, simplicia recta, promaxima 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 suleatis conniventibus autrarius hiantibus, disco rimaeformi aut rarius paullum aperto; amphithecio fusconigricante integro basi complete Paraphyses sparse ramosae. Asci clavati, 8-spori. Sporae incolores fusiformes, 6-loculares loculi cylindricis aequalibus, 18-20 X 3-4 µ.

Discussion:On limestone, New Providence (Brace, June 5, 1918, 9!i5ba, type). Opegrapha bahamensis resembles O. Chevallieri var. incarnata Riddle (Bull. Torrey Bot. Club 43 : 150. 1916), but differs in the six-celled spores. From O. zonata Koerb., it differs in the absence of soredia and hypothallus. The key-characters will serve to distinguish it from O. isabellina.
Distribution:New Providence Bahamas South America|