PART 1

OPEGRAPHACEAE Stizenb.
KEY TO GENERA
1. Exciple or hypothecium dark; exciple not byssoid; hypothecium, if dark, usually
confluent with exciple ................................................................................................................................ 2
2. Ascomata not aggregated, not in raised stroma-like structures............................................................3
3. Ascoma elongated, lirelliform; ascospores with a gelatinous sheath............................................... 4
4. Ascoma not pruinose; ascus of vulgata-type ............................................................. Opegrapha
4. Ascoma pruinose; ascus of grumulosa-type ........................................................ [Lecanographa]
3. Ascoma rounded, apothecioid; ascospores with or without a sheath .............................................. 5
5. Asci and ascospores not fragile; paraphysoids tightly interconnected,
not separating easily; ascus abietina- or grumulosa-type ............................................................ 6
6. Ascus abietina-type, endoascus strongly hemiamyloid with conspicuous
apical ring; ascospores without sheath ................................................................................... 7
7. Ascoma not pruinose or disk with bright colored pruina
[orange, yellow or greenish], KOH+ yellow or purple; exciple
carbonaceous, hyphae not distinguishable in KOH............................................Cresponea
7. Ascoma pruinose; pruina the same color as thallus, KOH-;
exciple dark brown, hyphae in outer part distinguishable in KOH ......................Lecanactis
6. Ascus grumulosa-type, endoascus weakly hemiamyloid with apical
ring little or not differentiated; ascospores with a sheath ................................. [Lecanographa]
5. Asci and ascospores fragile; paraphysoids dichotomously branched,
easily separating; ascus of Bactrospora-type...........................................................Bactrospora
2. Ascomata aggregated or in raised stroma-like structures..................................................................... 8
8. Ascoma perithecioid, in weakly raised stroma-like structures;
ascospores 4-celled, 23-27 × 2-3 µm; roccellic acid;
Duval and Putnam counties ......................................................................Chiodecton malmei Thor
8. Ascomata with exposed disk, not perithecioid; PD+ or C+
(protocetraric acid, psoromic acid or erythrin ..................................................................................... 9
9. Thallus C-, PD+ yellow or red orange .......................................................................................... 10
10. Thallus PD+ red orange (protocetraric acid); ascomata asteriform,
in raised "stroma" which is constricted at base; disk brown,
white pruinose; ascospores 4-celled, 50-70 × 4 µm;
peninsular Florida............................Syncesia [treated in 1990 as Chiodecton sp. Buck 3254]
10. Thallus PD+ yeliow (psoromic acid); ascomata round,
in rows .................................................................................Enterographa quassiaecola Fée
9. Thallus C+ red (erythrin), PD-; ascomata asteriform in raised "stroma"
which is constricted at base; disk light to dark brown, white pruinose;
ascospores 4-celled, tapered, 50-70 × 4-5 µm; Duval County ........................................................
2