Monographs Details: Verrucaria mamillaris Riddle
Authority: Britton, Nathaniel L. & Millspaugh, Charles F. 1920. The Bahama Flora.
Family:Verrucariaceae
Description:Species Description - Thallus epilithicus crustaceus uniformis effusus aut subdeterminatus haud linea nigra limitatus, cretaceo-albus vel sordide albidus, crassiusculus, continuus laevigatus inaequalis. Gonidia pleurococcoidea. Perithecia nigra hemisphaerica aut deplanata aut partim subconica, apiea mamilliformia aut rarius obtusa, basi deficientia, ad 0.8 mm. lata, dispersa solitaria, primum tota immersa dein 1/2 -2/3 emergentia tenuiter thallino-pruinata, demum elabentia foveolamque relinqnentia. Gonidia hymenialia nulla. Paraphyses simplices deliquescentes. Asci clavati 8-spori. Sporae in ascis biseriales ineolores ellipsoideae simplices membrana laevigata, 16-21 X 9-10 µ.

Discussion:

On limestone, vicinity of Cockburn Town, Watling's Island (Britton and Millspaugh, March 13, 1917, 6130, type) ; without station, New Providence {Brace, 9502, 9508). This species, belonging to the section Euverrucaria, differs from Verrucaria rupestris in the thicker thallus and the larger, mamillate, pruinose perithecia.

Distribution:New Providence Bahamas South America|