Graphidaceae of Central French Guiana

Keys to Collections Made By Richard C. Harris and William R. Buck
1990-1997

1. Spores transversely septate 2
1. Spores muriform or submuriform 4
2. Spores hyaline
 Graphis
2. Spores brown at maturity
 3
3. Ascomata round to elongate, ± tightly packed in distinctly to weakly raised stromata Sarcographa
3. Ascomata elongate (round or elliptical ascomata not yet known in this flora), lacking stromatic tissue Phaeographis
4.Ascomata mostly elliptical or round
 5
4. Ascomata lirelline, elongate or sometimes elliptical, but without stromatic tissue
 6
5. Ascomata solitary, round, less than 0.5 mm broad, sessile, usually numerous, surrounded by cup-like, erect thalline margin, spores mostly hyaline to tinted in age Gyrostomum
5. Ascomata aggregated, round to slightly elongated, tightly packed in distinctly raised stromata, disks usually gray-pruinose, spores mostly hyaline to tinted in age Glyphis
6. Spores brown
 Phaeographina
6. Spores hyaline to sometimes slightly yellowed -- Some species of Graphis will key  here since some taxa have one or two cells longitudinally divided
 Graphina