Monographs Details: Opegrapha columbina Riddle
Authority: Britton, Nathaniel L. & Millspaugh, Charles F. 1920. The Bahama Flora.
Family:Roccellaceae
Description:Species Description - Thallus crustaceus uniformis effusus haud limitatus, columbina aut plumbeus aut partim nigrescens, tenuissimus farinulentus. Gonidia chroolepoidea. Apothecia dispersa aut conglomerato-approximata, superficialia elevata, simplicia recta oblonga, 0.5-1.5 mm. longa, circa 0.2 mm. lata, tota nigra, labiis haud suleatis conniventibus disco rimaeformi; amphithecio nigricante integro basi eompleto crasso. Paraphyses ramosae. Asci clavati, 8-spori. Sporae incolores fusiformes, 8-loeulares loculis cylindricis aequalibus, 24-28 X 5-7 µ.

Discussion:

On limestone, vicinity of Governor's Harbor, Eleuthera Island (Britton and Millspaugh, February 19-20, 1907, 5533, type). This species is most closely related to Opegrapha ophites Tuck, fapud Riddle in Bull. Torrey Bot. Club 43: 150. 191G), but differs in the short, straight, oblong apotheeia. From O. lithyrga Ach. it may be distinguished by the color of the thallus and the wider spores

Distribution:Eleuthera Bahamas South America|