PART 1

3. Spores Physcia-type; zeorin present ................................................................................................................................................ 4
4. Lobes narrow, often convex, not confluent, branching irregular; apothecial
disk not or only weakly pruinose; margin thin, smooth, not raised;
ascospores small, 15-17 × 6-7.5 µm; Calhoun, Dixie, Gadsden
and Hamilton counties..............................................................................................................................P. pumilior R. C. Harris
4. Lobes broader, flatter, often confluent, branching more nearly dichotomous;
apothecial disk normally strongly pruinose; margin thick, often becoming
crenulate, usually strongly raised; ascospores larger, 18-25 × 8-12 µm;
mostly north of Mason-Dixon line..........................................................................................[P. aipolia (Ehrh. ex Hampe) Fürnr.]
3. Spores Pachysporaria-type, 19-20 × 8-9 µm; zeorin absent or trace;
Dade County and Florida Keys ................................................................................................................... Physcia sp. Small 7569
2. Lobes not white spotted or if white spotted then only in the older parts,
not on lobe ends; zeorin absent; apothecia with rhizines on back; ascospores
Pachysporaria-type, 20-25 × 8-11 µm; throughout Florida............................................................................ P. neogaea R. C. Harris
1. Thallus sorediate ..................................................................................................................................................................................... 5
5. Soralia mainly marginal....................................................................................................................................................................... 6
6. Underside dark or pale, not striate; lower cortex paraplectenchymatous ..................................................................................... 7
7. Underside pale; soralia marginal, not pustular ............................................................................................................................ 8
8. Medulla KOH-; zeorin absent; thallus not "frosted", thin and fragile;
Lake County, "SW Florida" and Louisiana...........................................................................................................P. crispa Nyl.
8. Medulla KOH+ yellow; zeorin present; thallus "frosted", thicker;
margins often undulate; Collier and Hillsborough counties ..............................................................P. undulata Moberg
7. Underside dark; soralia marginal, often pustular; soredia coarse;
zeorin present; throughout Florida ..................................................................................................P. sorediosa (Vainio) Lynge
6. Underside pale at tips with dark longitudinal lines; lower cortex more or less
prosoplectenchymatous; lobe margins pruinose especially at tips; common,
throughout Florida ..........................................................................................................................................P. atrostriata Moberg
5. Soralia mainly laminal; underside pale ............................................................................................................................................... 9
9. Lower cortex prosoplectenchymatous; zeorin absent, unknown terpenoid present;
northern Florida .................................................................................................................................................P. americana Merr.
9. Lower cortex paraplectenchymatous; zeorin present; Columbia and Dade counties................................ P. poncinsii Hue
NOTES
Physcia poncinsii Hue
New to North America. FLORIDA. Columbia County: W side of Woodland Avenue, off Co. Rd. 138, 0.5 mi W of U.S. Hwy. 27,
29°51'N, 82°39'W, on Berchemia scandens, 5 Dec 1994, Harris 36037 (NY); Dade County: Coral Gables, Fairchild Tropical Garden,
4 Nov 1982, Tucker 25266 (LSU).
Physcia undulata Moberg
New to North America. FLORIDA. Collier County: Fakahatchee Strand State Preserve, Royal Palm Hammock, on Ilex, 6 Dec
1992, Harris 29942; Hillsborough County: Hillsborough River State Park, on Carya, 3 Dec 1992, Harris 29691. LOUISIANA. West
Feliciana Parish: Locust Grove Cemetery, ca. 4 mi from Bains, on grave stone, 13 Sep 1975, Buck B596 (all NY).
PYXINE Fr.
1. Thallus UV-; medulla PD+ orange or PD-............................................................................................................................................... 2
2. Medulla white or tinted yellow or orange, PD+ orange (testacein agg.) ............................................................................................. 3
3. Lobes with marginal dactyls (isidiate/pustulate) ................................................................................................................................ 4
4. Dactyls fragile, almost immediately breaking down into granular soredia;
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