PART 1

5. Ascospores basically 4/ascus, 11-13 × 1-2-septate, with large cells,
53-63 × 16-18 µm; ascomata pallid to dark brown, ± hemispherical,
smooth; Collier County.................................................... T. cinerascens (Vainio) R. C. Harris
4. Ascospores transversely 11-17-septate, 2-4/ascus, 75-100 × 17-20 µm;
ascomata pallid to brownish, smooth; on branches; locally common,
Collier County....................................................................... T. geminipara (Malme) R. C. Harris
3. Growing on leaves; ascospores 8/ascus, transversely septate, 50-90 × 12-21 µm
(Santesson, 1952); in Egan (1987) as fide Tucker, not seen..............................................................
.........................................................................................................[A. fugiens (Müll. Arg.) R. Sant.]
2. Growing on rock .................................................................................................................................... 9
9. Ascospores muriform ...................................................................................................................... 10
10. Ascomata without dark brown clypeus (involucrellum) ............................................................. 11
11. Ascospores oblong-ellipsoidal, ± tapered at one end,
over 20 µm long................................................................................................................... 12
12. Ascospores medium sized, 20-36 × 8-13 µm................................................................ 13
13. Thallus thin, continuous to ± rimose........................................................................ 14
14. Ascospores 24-32 × 9-13 µm, 5-7 × 2-3-septate............................................... 15
15. Thallus light brown, olive brown to olive green;
ascospores (24-)27-32 × 9-13 µm, 6-7 × 2-septate;
New Jersey, Oklahoma, Neotropics, Africa,
China, Australia ..........................................[T. brasiliensis (Müll. Arg.) Vainio]
15. Thallus pale ocher to yellow brown;
ascospores 24-30 × 9-13 µm, 5-7 × 2-3-septate;
Arctic ............................................................[T. sordidula (Th. Fr.) H. Mayrh.]
14. Ascospores 20-27 × 8-11 µm, 6-9 × 1-2-septate;
Louisiana, Puerto Rico ................................................ [T. sastreana R. C. Harris]
13. Thallus thick, rimose-areolate; ascospores 24-36 × 9-13 µm,
6-8 × (1-)2-3-septate; California, Macaronesia, SW Europe.......................................
......................................................................................[T. inductula (Nyl.) H. Mayrh.]
12. Ascospores larger, 30-45 × 12-19 µm, 7-9 × 3-septate;
Georgia, Neotropics, South Africa, Australia, New Zealand..............................................
..............................................................................................[T. luridella (Nyl.) H. Mayrh.]
11. Ascospores broadly ellipsoidal, small, to 20 × 8-11 µm,
6-7 × 2-3-septate; New York ..............................................................[T. humilis R. C. Harris]
10. Ascomata with an open dark brown clypeus (involucrellum);
ascospores 35-37 × 14-19 µm, 6-8 × (1-)2-3-septate;
California, Baja California.............................................................................[T. weberi H. Mayrh.]
155