Monographs Details: Opegrapha isabellina Riddle
Authority: Britton, Nathaniel L. & Millspaugh, Charles F. 1920. The Bahama Flora.
Family:Roccellaceae
Description:Species Description - Thallus crustaceus uniformis effusus haud limitatus, isabellinus minute albo-maculatus, tenuis continuus laevigatus. Gonidia chroolepoidea. Apotheeia dispersa aut rarius aggregata superficialia elevata, simplicia recta aut rarius flexuosa, oblonga aut linearia, 0.8-2.0 mm. longa, 0.1-0.2 mm. lata, tota nigra, labiis haud suleatis conniventibus disco rimaeformi; amphithecio nigricante integro basi complete Paraphyses ramosae. Asci clavati, 8-spori. Sporae incolores, fusiformes, 6-8-loeulares loculis cylindricis aequalibus, 20-24 X 4-5 µ.

Discussion:

On limestone, New Providence (Brace, May 20, 1918, 9$37, type). In the Tuckerman 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 European species.

Distribution:Cuba South America| New Providence Bahamas South America|