106 IS. GRAPHIDACEAE [53. Graphis 



53. Graphis Adans., Fam. PL 2:11. 1763. 



Thallus forming a thin, usually smooth crust upon the substratum, partly or 

 wholly within the substratum, devoid of differentiation into layers; apothecia 

 linear, curved, often branched, more or less immersed, the disk closed to open, 

 commonly black, the exciple colored like the disk, often surrounded by a thin to 

 thicker, thalloid one; hypothecium hyaline to brownish black; hymenium hyaline; 

 paraphyses unbranched, commonly distinct; asci clavate to cylindrico-clavate ; 

 spores 4, more commonly 8, hyaline, oblong-ellipsoid, ellipsoid, or long-ellipsoid, 

 3-many-septate, the cells lenticular. 



The algal host is Trentepohlia. 



A. Spores 1-3-septate 



B. Spores 1-septate 1- G. turbulenta 



B. Spores 3-septate 



C. Apothecia rarely more than 4 mm. in length 

 D. Thallus olive-green to lighter 

 E. Apothecia not branched 



F. Apothecia straight or curved 2. G. botryosa 



F. Apothecia 2-3-angled . 4. G. Dumastii 



E. Apothecia furcately branched 3. G. nitida 



D. Thallus greenish gray 5. G. Beaumontii 



C. Apothecia rarely less than 4 mm. in length 

 D. Apothecia rarely branched 



E. Thallus indicated by a brownish to ashy gray area . . 6. G. Afzelii 

 E. Thallus greenish gray to olive-green 



F. Apothecia straight to curved and flexuous . . . . 7. G. rufula 

 F. Apothecia curved, flexuous, and abruptly bent 



or recurved 8. G. subparilis 



D. Apothecia 1 or 2 times branched 9. G. floridana 



A. Spores 5- or more septate 



B. Apothecia not more than 3 mm. in length 

 C. Spores rarely less than 25 /z in length 

 D. Apothecia rarely or never branched 



E. Thallus greenish gray to olive-green 20. G. leucopepla 



E. Thallus brownish yellow 19. G. intertexta 



D. Apothecia 1 or 2 times branched 17. G. lineola 



C. Spores 16-25 X 5-8 fi 10. G. mosquitensis 



B. Apothecia usually more than 3 mm. in length 

 C. Apothecia rarely more than 6 mm. in length 

 D. Spores more than 35 fi in length 

 E. Exciple striate 



F. Apothecia rarely branched 



G. Thallus smooth to wrinkled or granulose . . 22. G. elegans 

 G. Thallus smooth to minutely rough . . . 24. G. rimulosa 



F. Apothecia much branched 23. G. striatula 



E. Exciple not striate 21. G. Poitaeoides 



D. Spores rarely more than 40 fi in length 

 E. Apothecia rarely branched 



F. Apothecia narrow, not more than 0.2 mm. across 



G. Spores 5-9-septate 13. G. tenella 



G. Spores 7-11-septate 18. G. Celtidis 



F. Apothecia wider, not less than 0.2 mm. across 



G. Spores 18-28 X 5-7 m 12. G. atrorubens 



G. Spores 25-38 X 6-9 n 15. G.eulectra 



E. Apothecia more or less branched 



F. Thallus not limited by a black line 



G. Thallus thick, powdery . . . . 16. G. scripta pulverulenta 

 G. Thallus thinner, rough to wrinkled .... 16. G. scripta 

 F. Thallus limited by a black line . . . 16. G. scripta limitata 



C. Apothecia reaching 8-10 mm. in length 



D. Apothecia straight and parallel 16. G. scripta topographica 



D. Apothecia more or less branched 



E. Thallus smooth 14. G. intricata 



E. Thallus wrinkled or granulose 11. G. Pavoniana 



