PART 1

Mém. Soc. Sci. Nat. Cherbourg 3: 186. 1855. Type. M. elabens Flotow ex Nyl.
Bottaria Massal., Misc. lichenol. 43. 1856. Holotype. B. composita Massal.
Mycoporellum Müll. Arg., Rev. Mycol. (Toulouse) 6: 14. 1884. Lectotype (Riedl, 1962). Mycoporum
sparsellum Nyl.
Syngenosorus Trevisan, Conspect. Verruc. 15. 1860. Lectotype (chosen here). Melanotheca arthoniella Nyl.
Chlorodothis Clements, Genera of fungi 50. 1909. Holotype. Mycoporellum lahmii Müll. Arg. (= Mycoporum
lacteum)
Sciodothis Clements, Genera of Fungi 50. 1909. Holotype. Mycoporopsis leucoplaca Müll. Arg. (=
Mycoporum lacteum)
1. Ascoma compound, with several to many chambers, each with a pore,
each containing many asci ........................................................................................................................ 2
2. Ascospores transversely septate .......................................................................................................... 3
3. Ascospores mostly 2-celled, some becoming 4-celled when old...................................................... 4
4. Ascospores fusiform, relatively slender, 2.5-4 times longer than broad........................................ 5
5. Ascospores larger, over 15 × 5 µm; ascoma without well developed
brown basal layer; macroconidia not known ............................................................................. 6
6. Ascospores 17-20(-22) × 5-6(-7) µm; very common, throughout
Florida .................................................................... M. eschweileri (Müll. Arg.) R. C. Harris
6. Ascospores 20-27 × 6.5-8 µm; not uncommon, throughout
Florida ...................................................................................M. lacteum (Ach.) R. C. Harris
5. Ascospores small, 10-13 × 3-3.5 µm; ascoma with a distinct brown
basal layer; macroconidia oblong, ca. 5 × 2 µm; on Taxodium or
old wood; Collier and Duval counties ...................................................... M. buckii R. C. Harris
4. Ascospores relatively short and "fat", 1.5-2.5 times longer than broad,
17-22(-25) × 7.5-10 µm; upper cell markedly shorter than lower;
common, throughout Florida ............................................................................M. sparsellum Nyl.
3. Ascospores mostly 4-celled, only immature ascospores 2-celled..................................................... 7
7. Ascospores 17-22 × 5.5-7 µm; physes obscured by oil;
rare, Citrus and Escambia counties ..................................M. californicum (Zahlbr.) R. C. Harris
7. Ascospores 15-17 × 4-5.5 µm; physes not obscured by
oil; rare, Duval County............................................. Tomasellia americana (Willey) R. C. Harris
2. Ascospores muriform ............................................................................................................................ 8
8. Ascospores over 30 × 12 µm ........................................................................................................... 9
9. Ascospores 30-38(-43) × 12-17(-18) µm, with 8-9 rows of locelli;
Franklin, Gilchrist and Okaloosa counties.......................M. compositum (Massal.) R. C. Harris
9. Ascospores (36-)39-48(-55) × (14-)16-21(-24) µm, with (9-)10(-11)
rows of locelli; Duval County ........................................................ M. pycnocarpoides Müll. Arg.
8. Ascospores 23-28(-30) × 9-12 µm, with 8 rows of locelli; not uncommon,
northern Florida ........................................................................................M. acervatum R. C. Harris
62