PART 1

COLLEMA Wigg.
[The non-lichenized loculoascomycete, Myriangium duriaei Montagne & Berkeley forms small cushions with apothecium-like ascomata
and can in the field be confused with a tiny Collema. The brown, cellular tissue, lack of photobiont and globose asci with muriform
ascospores readily distinguish it in the lab.]
1. Lobes large and broad ............................................................................................................................................................................ 2
2. Lobes longitudinally ridged and pustulate, isidiate or not.................................................................................................................... 3
3. Isidia absent (C. pulcellum Ach. s. lat.)............................................................................................................................................. 4
4. Ascospores narrower, under 5 µm wide ....................................................................................................................................... 5
5. Apothecial disks strongly white pruinose; south to Polk County .................................................................................................
.........................................................................................................................C. pulcellum var. leucopeplum (Tuck.) Degel.
5. Apothecial disks not pruinose; Duval County ......................................................................C. pulcellum Ach. var. pulcellum
4. Ascospores broad, over 5 µm wide; apothecial disk occasionally pruinose;
north to Flagler County.............................................................................C. pulcellum var. subnigrescens (Müll. Arg.) Degel.
3. Isidia present, mainly on ridges and pustules; apothecial disk pruinose; proper exciple
paraplectenchymatous; Citrus, Collier, Hernando and Levy counties (sterile),
"S.W. Florida" (with apothecia) ..............................................................C. furfurceum (Arn.) Du Rietz var. luzone (Räs.) Degel.
2. Lobes not ridged or pustulate, with ± globose isidia; a single scrappy
collection from Madison County tentatively assigned here ........................................................................... C. subflaccidum Degel.
1. Lobes narrow, often anastomosing......................................................................................................................................................... 6
6. Ascospores rod-shaped with more than 2 cells or if broader, submuriform ...................................................................................... 7
7. Apothecia subglobose, mostly immersed in the thallus; ascospores globose to ellipsoid, submuriform ..................................... 8
8. Thallus foliose; proper exciple paraplectenchymatous; ascospores ellipsoid,
2-3 × 4(-6)-celled, 20-40 × 11-15 µm (Degelius); Dade County.................................................................... C. pustulatum Ach.
8. Thallus subfoliose; proper exciple prosoplectenchymatous; ascospores globose
to subglobose, 2 × 3-4-celled, 8.5-13 µm in diameter or 10.5-17 × 8.5-10.5 µm;
Jackson County and reported by Degelius (1974) from Caloosa River ......................................................C. callibotrys Tuck.
7. Apothecia cup-shaped, sessile to stalked; ascospores narrow, ca. 2 µm wide,
transversely septate with blunt ends; Leon and Seminole counties ................................................................ C. leptaleum Tuck.
6. Ascospores 2-celled, 8.5-21 × 3-6.5 µm; thallus lobes small and crowded;
apothecia usually numerous; rare, Citrus and Hillsborough counties......................................................C. conglomeratum Hoffm.
LEPTOGIUM (Ach.) Gray
Since the bulk of NY's collections of Leptogium are on loan and the new treatment, when it appears, is likely to encompass
considerable change, I include Moore's key for completeness and convenience.
1. Thallus larger, clearly foliose................................................................................................................................................................... 2
2. Thallus isidiate...................................................................................................................................................................................... 3
3. Thallus wrinkled................................................................................................................................................................................. 4
4. Lobes distinct and not anastamosing, the margins not thickened; isidia not granular ................................................................ 5
5. Thallus longitudinally wrinkled; isidia concentrated along the ridges;
throughout Florida ......................................................................................................................L. isidiosellum (Riddle) Sierk
5. Thallus irregularly wrinkled; isidia marginal or scattered on the surface ................................................................................. 6
6. Isidia mostly marginal and associated with apothecia; on hardwood trees;
throughout Florida ............................................................................................................. L. marginellum (Swartz) S. Gray
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