PART 1

Verrucaria subantecellens Nyl., Flora 59: 364. 1876, nom. nud. Arthopyrenia subantecellens
Müll. Arg., Bot. Jahrb. Syst. 6: 403. 1885. Type. CUBA. Wright, Verr. Cub. 2 (MSC, holotype
fragment; H-Nyl 769, isotype).
Arthopyrenia griseola Müll. Arg., Rev. Mycol. (Toulouse) 10: 182. 1888. Type. PARAGUAY.
Paraguarí, Balansa (G, holotype).
Presumably on the basis of the ascospores that soon become 4-celled, brownish and granular
ornamented, Riedl removed this species from Arthopyrenia to Mycoporopsis even though the ascomata are
uniloculate. Placement in Mycoporum ( incl. Mycoporopsis sensu Riedl) is further supported by the large
ascospores, large asci, thick walled in the upper part and the characters of the hamathecium. Purvis et al.
(1992) spelled the epithet "antecellans". All the specimens in Nylander's herbarium have the "-ens" spelling
and my small Latin dictionary gives "antecello, -ere" the participle of which should end in "-ens". The British are
noted scholars of Latin and perhaps there is some linguistic point I have missed. However, until I am
corrected, I will spell the epithet "antecellens".
Mycoporum buckii R. C. Harris, sp. nov.
Similis M. sparselli sed ascomatis planioribus, strato brunneo sub hymeniis, ascosporis minoribus, 9.5-12
× 2.5-3 µm et macroconidiis oblongiis, ca. 5 × 2 µm.
Type. FLORIDA. Duval County: Flood plain forest E of San Pablo River (Intracoastal Waterway), W of 17th St.
N., dead portion of trunk of oak, 19 Jun 1975, Buck B175 (NY, holotype; MICH, isotype? not seen).
Thallus a whitish blotch on substrate. Ascomata black, superficial, compound, multiostiolate, with many
chambers, orbicular to elliptical (elongated with the grain of the wood), 0.5-1.0 mm diam, or to ca. 0.5 × 1.0
mm, with a brown basal layer. Asci obclavate to ± fusiform, 40-55 × 10-14 µm, with ascospores weakly
biseriately to irregularly arranged. Ascospores fusiform, colorless, 2-celled, 10-13 × 3-3.5 µm. Microconidia
not found. Pycnidia with macroconidia, oblong, colorless, ca. 5 × 2 µm.
Mycoporum buckii is anomalous in several ways, the narrow asci which are not basally swollen, the well
developed brown layer at the base of the ascoma and the presence of what can be interpreted as
macroconidia. However, I would not feel comfortable creating a new genus and believe it is best
accommodated in Mycoporum pending more thorough investigation. It is easily recognized by the small
ascospores. Some species of Strigula have ascospores this small but have small, uniloculate ascomata. In
addition to the cited collections it has been collected in Belize by Mason Hale.
Additional specimens. FLORIDA. Collier County: Fakahatchee Strand State Preserve, 1.2 mi from N
entrance on W. J. James Memorial Scenic Drive, open Taxodium swamp, on trunk of Taxodium, 6 Dec 1992,
Buck 22817 (NY). DOMINICAN REPUBLIC. Prov. Monte Cristi: SE of El Morro de Monte Cristi, ca. 20 m, low dry
forest near sea, 9 Jan 1987, Harris 19603 (JBSD, NY).
Mycoporum californicum (Zahlbr.) R. C. Harris, comb. nov.
Mycoporellum californicum Zahlbr., Ann. Mycol. 10: 363. 1912. Mycoporopsis californica (Zahlbr.)
Riedl, Sydowia 16: 216. 1962[1963]. Tomasellia californica (Zahlbr.) R. C. Harris in Tucker &
Jordan, Wasmann J. Biol. 36: 87. 1979, comb. inval. (33.2). Type. CALIFORNIA. Santa Monica
Mtns., Hasse 1003 (FH, isotype).
This species is separated from M. eschweileri, that has similar sized ascospores, by the early
development of 4-celled ascospores, and from Tomasellia americana by larger ascospores and hamathecium
obscured by oil droplets. Its distribution is mainly western. The easternmost record previously was from
Texas. However, a number of ± western species are turning up in northern Florida.
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