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VEBRUCARIACEAE. 



Terrestrial, saxicolous, or corticicolous plants, compased of 

 filaments without chlorophyll and of cells containing 

 chlorophyll. 

 Aquatic plants, or microscopic terrestrial or corticicolous 



organisms with chlorophyll. 

 Terrestrial or corticicolous plants, or microscopic aquatics, 

 wholly without chlorophyll. 

 Vegetative stage mycelial. 

 Vegetative stage plasmoidal. 



CLASS 1. LICHENES. 



Class 1. LlCHBNES. 



Class 2. Algae. 



Class 3. 

 Class 4. 



Fungi. 

 Myxomycetes. 



Contributed by Lincoln W. Riddle. 



Fruit a perithecium, more or less flask-shaped, opening by a 



pore at maturity. 

 Fruit an apothecium, open at maturity. 



Apothecia disk-shaped, circular ; asci deliquescing before 



the spores mature. 

 Asci persisting until after the discharge of the spores. 

 Apothecia typically linear, elliptical, or angular ; 



rarely circular, and then without an exciple. 

 Apothecia circular, disk-shaped or cup-shaped. 



Order 1. Pybexulales. 



Order 2. Caliciales. 



Order 3. Geaphidales. 

 Order 4. Lecideales. 



Order 1. PYRENULALES. 



Perithecia with an apical ostiole. 

 Thallus crustose. 



Perithecia solitary. 



Gonidia : Plcurococcus. 

 Gonidia : Trentepohlia. 

 Perithecia imbedded in a stroma. 

 Thallus squamulose or foliose. 

 Perithecia with a lateral ostiole. 

 Perithecia solitary. 

 Perithecia imbedded in a stroma. 



Fam. 1. Verrucaeiaceae. 

 Fam. 2. Pyrenulaceae. 

 Fam. 3. Teypetheliaceae. 

 Fam. 4. Dermatocarpaceae. 



Fam. 5. Parathemaceae. 

 Fam. 6. Asteotheliaceae. 



Family 1. VERRUCARIACEAE. 



1. VERRUCARIA Pers. 



1. V. mamillaris. 



2. V. rupestris. 



3. V. muralis. 



4. V. nigrescens. 



Perithecia failing out and leaving pits in the rock. 



Perithecia pruinose; ostiole papillate. 



Perithecia nudate above ; ostiole plane. 

 Perithecia not leaving pits in the rock. 



Thallus nale, tinged with green or brown, perithecia super- 

 ficial. 



Thallus dark olive-brown, perithecia immersed. 



1. Verrucaria mamillaris Riddle, sp. now 



Thallus epilithicus crustaceus uniformis effusus aut subdeterminatus haud 

 linea nigra limitatus, cretaceo-albus vel sordide albidus, crassiusculus, con- 

 tinuus laevigatus inaequalis. Gonidia pleurococcoidea. Perithecia nigra hemi- 

 sphaerica aut deplanata aut partim subconica, apiea mamilliformia aut rarius 

 obtusa, basi deficientia, ad 0.8 mm. lata, dispersa solitaria, primum tota im- 

 mersa dein Yo-% emergentia tenuiter thallino-pruinata, demum elabentia 

 foveolamque relinqnentia. Gonidia hymenialia nulla. Paraphyses simplices 

 deliquescentes. Asci clavati 8-spori. Sporae in ascis biseriales ineolores ellip- 

 soideae simplices membrana laevigata, 16-21 X 9-10 fi. 



On limestone, vicinity of Cockburn Town, Watling's Island (Britton and Mills- 

 paugh, 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. 



2. Verrucaria rupestris Schrad. Spicil. Fl. Germ. 109. 1794. 



On limestone, New Providence, Eleuthera, Cat Island, Watling's Island : 

 mopolitan. 



-cos- 



