PART 1

4. Ascospores light to dark brown......................................................................................................................................................... 14
14. Ascospores 5-10 transversely septate......................................................................................................................................... 15
15. Ascospores 6-celled, 17-20 × 6-7 µm; stictic acid agg.;
apothecia with rim recurved and splitting; disk white
pruinose; Collier County..................................................................................................................T. platycarpoides Tuck.
15. Ascospores 7-11-celled, 33-60 × 6-10 µm; no substances;
apothecia emergent with broad, round pores; exciple pulling
away from margin; Santa Rosa and Seminole counties....................................................................... T. lacteum Krempelh.
14. Ascospores densely muriform, 1/ascus, 105-140 × 24-30 µm;
no substances; apothecia emergent with broad, round pores;
exciple pulling away from margin; Dixie, Liberty, Marion
and Santa Rosa counties ............................................................................................................. T. monospermum R. C. Harris
NOTES
Thelotrema platycarpoides Tuck.
Thelotrema platycarpoides was originally described from Cuba. Hale (1981) was in error describing the ascospores as "3-4loculate".
Tuckerman described them as 6-celled and an examination of an isolectotype (BUF) corroborates this. (The very similar T.
platycarpum Tuck. does have 4-celled ascospores and also differs in larger apothecia.)
New to North America. FLORIDA. Collier County, Fakahatchee Strand State Preserve, Royal Palm Hammock, 26°01'N, 81°25'W,
6 Dec 1992, Harris 29940 (NY).
"CALICIALES"
"Calciales" are used here in an informal, highly artificial, sense to include not only the Caliciaceae and
Mycocaliciaceae but mazaedioid genera belonging to other families or of uncertain position. Mycocaliciaceae
and Caliciaceae are clearly not at all closely related. The familial disposition of Heterocyphelium Vainio and
Tylophoron Nyl. is uncertain. The first is monotypic and treated in the generic key. The second is left in the
Caliciaceae until its relationships are better understood.
KEY TO GENERA
1. Apothecia stalked or if almost sessile, then very small ............................................................................ 2
2. Asci disintegrating, forming a mazaedium ........................................................................................... 3
3. Ascospores simple ............................................................................................................................ 4
4. Ascospores small (5 µm or less), more or less globose, pale,
with weak ornamentation formed by cracking of exospore;
lichenized, on bark or leaf bases of Sabal................................................................ Chaenotheca
4. Ascospores larger (to 17µm), lemon-shaped, dark,
with strong reticulate ribbing; apothecia top-shaped with short,
thick stalk; parasymbiont on Pertusaria; so far only Gulf Coast
from Dixie to Collier County.........................................................Sphinctrina tubiformis Massal.
3. Ascopores 2-celled, brown .................................................................................................. Calicium
2. Asci persistent, not forming mazaedium (Mycocaliciaceae) ................................................................5
5. Growing on old wood or bark ............................................................................................................ 6
6. Stalk dark, usually of more or less parallel hyphae;
19