PART 1

REQUIENELLACEAE Boise
The Requienellaceae are recognized here in the restricted, original sense as discussed above under
Pyrenulaceae. While comfortable with the family, I have never been satisfied with the species level taxonomy.
However, as Boise had decided, not readily changeable, opinions, I kept my mouth shut until now. I have
always felt that R. subcollapsa and Acrocordiella occulta (see Pyrenulaceae) merited recognition.
REQUIENELLA Fabre
1. Young ascospores ± thin walled................................................................................................................ 2
2. Ascospores with cells densely filled with small oil droplets, 6-celled,
ca. 29-33 × 10-12 µm; ostiolar area inspersed with large oil drops;
Europe.....................................................................................[Requienella seminuda (Persoon) Boise]
2. Ascospores with 1-few oil droplets/masses, 8-celled, sometimes with
one cell longitudinally divided, ca. 36-48 × 11-13 µm; Europe ................................................................
................................................................................................[Requienella lichenopsis (Massal.) Boise]
1. Young ascospores with a well developed "cap" of endospore in the
terminal cells; mature ascospores 4-celled, occasionally with 1-2 cells
longitudinally subdivided, ca. 25-29 × 8-10 µm; on soft barked deciduous
trees, eastern North America ............................. [Requienella subcollapsa (Ellis & Everhart) R. C. Harris]
NOTES
Requienella subcollapsa (Ellis & Everhart) R. C. Harris, comb. nov.
Lophiostoma subcollapsa Ellis & Everhart, J. Mycol. 2: 100. 1886. Type. NEW JERSEY. Newfield,
on outer bark of living Nyssa, Jun 1886, Ellis (NY, holotype).
I am preliminarily assuming that there is only a single species in North Americ but I have not yet reexamined
all the specimens cited by Boise as R. seminuda so that this assumption may prove incorrect.
TRYPETHELIACEAE Zenker
Harris (Acta Amazonica 14(1/2, Supl.): 55-80. 1984[1986]) included the genus Pleurotrema Müll. Arg. in
the Trypetheliaceae. It has been since removed to its own family, Pleurotremataceae, in the non-lichenized
unitunicate ascomycetes. (See Pyrenulaceae for more detailed comments).
Aptroot (Biblioth. Lichenol. 44, 1991) recognized two additional genera of Trypetheliaceae, Megalotremis
Aptroot and Ornatopyrenis Aptroot. Unfortunaely Aptroot's descriptions of ascus and hamathecium are not
adequate and he did not trouble with conidia. I have not seen the types of either genera.
Aptroot's hesitation in describing Megalotremis was well founded. Megalotremis, based on M. verrucosa
(Makhija & Patwardhan) Aptroot, is certainly a synonym of Anisomeridium (Aptroot's drawings show both
Anisomeridium-type ascospores and ascus tip.) Two-celled ascospores are unknown in the Trypetheliaceae.
Anisomeridium, with a handful of exceptions, has 2-celled ascospores and species having asci with only 2 or 4
ascospores are not uncommon. The thallus of M. verrucosa is corticate but corticate thalli are also seen in
Anisomeridium (A. glaucescens and A. clandestinum). The second species, M. biocellata Aptroot, is almost
certainly a species of Arthopyrenia (probably the same as Tomasellia dispora Müll. Arg., see Arthopyrenia).
Most species of Arthopyrenia show some constriction of the ascospore wall ± grading into the "biocellate" type
("porospore" in Vainio's terminology). (There are probably ten or so species with the porospore ascospore
type.) Aptroot (Nova Hedwigia 60: 338. 1995) has recognized a third species, M. megalospora (Vainio)
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