Monographs Details: Thelotrema paralbidum Riddle
Authority: Britton, Nathaniel L. & Millspaugh, Charles F. 1920. The Bahama Flora.
Family:Graphidaceae
Description:Species Description - Thallus epiphloeodes crustaceus uniformis effusus haud limitatus, sordide albidus, in crassitudine mediocris, rimoso-areolatus areolis subquadrangularibus 0.6-1.0 mm. latis inaequalibus vel leviter eonvexis. Gonidia chroolepoidea. Apothecia approximata aut partim dispersa, areolis thallinis immersa haud verrucas formantia, suborbicularia 0.5-0.8 mm. lata, disco aperto piano albissimo farinoso, superficiem thalli subaequante aut paullum submerso, margine duplice crenato aut sublacerato parum prominente; intus hyalino. Paraphyses simplices. Asci clavati, 8-spori. Sporae incolores ovideae murali-divisae, 8-10- loculares, loculis cubicis 2-3-locellatis, 22-25 X 9-11 µ.

Discussion:

On bark, Maidenhead Coppice, New Providence (Elizabeth G. Britton, February, 1905, 323J,, type). Thelotrema paralbidum is externally similar to Ocellularia albida (Nyl.) Riddle, (Thelotrema albidum Nyl. Act. Soc. Sci. Fenn. 7: 451. 1863), but differs in sporecharacters. It is, perhaps, most closelv related to T. velatum Muell. Arg. (Bull. Soc. Roy. bot. Belg. 321 : 26. 1894), but differs in the thicker, areolate thallus, the white disk, and the shorter spores.