A Lichenological Legacy – Festschrift Thomas H

seems to differ in forming marginal and laminal, globose to terete isidia and in
having longer ascospores (6.5–10 × 2.5–3.5 μm; cf. ELIX 2009). See also P.
phaeobyssina for discussion.
Phyllopsora parvifoliella is neotropical, occurring from Florida to Brazil
(BRAKO 1991). New to Haiti.
Specimens examined: CUBA. Wright, Lich. Cub. 182 (H-NYL 20545, holotype; BM, UPS
isotypes). HAITI. Imshaug & Wetmore 2873, 23051, 23059 (MSC). NETHERLANDS ANTILLES.
Sipman 14820, 14833, 14852, 15069, 56742a (B).
27. Phyllopsora pertexta (Nyl.) Swinscow & Krog
The Lichenologist 13: 244 (1981). – Lecidea pertexta Nyl., Annls Sci. Nat., Bot., sér. 4, 19: 347
(1863). – Type: CUBA, “in ins. Cuba”, Wright s.n. (H-NYL 17344, holotype) [no lichen
substances]. – Lecidea microphyllina var. subgranulosa Tuck., Proc. Am. Acad. Arts. Sci. 6: 278
(1864).
(Colour Plate 16B)
Description: Prothallus often well developed, white to dark brown. Thallus
effuse, crustose, not radiating at the margin. Areolae small, up to 0.06 mm wide,
discrete when young, soon adjoining to form a more or less continuous crust,
brownish green, dull, epruinose, pubescent along the margin. Isidia and soredia
lacking. Upper cortex poorly defined, resembles type 2, 5–10 μm thick, not
containing crystals. Medulla not containing crystals, PD–, K–. Apothecia
common, up to 1.5 mm diam., plane when young, becoming weakly to moderately
convex, reddish brown, rounded to irregular, simple to conglomerate, with a thin,
more or less excluding, paler, sometimes finely pubescent margin. Excipulum
pale brown to colourless, patchily reddish brown, K+ purple (red pigment).
Hypothecium pale brown or patchily reddish brown, K+ purple (red pigment) in
upper part, pale brown to colourless in lower part. Epithecium colourless, K–. No
crystals in apothecium. Ascospores acicular, simple, with up to 3 pseudosepta,
28–41 × ca. 1.5–2 μm (n = 22).
Chemistry: no lichen substances (by TLC).
Notes: Phyllopsora cognata differs in having yellowish brown apothecia, shorter
ascospores (19–30 μm long), and in containing atranorin. The paleotropical P.
borbonica Timdal & Krog is closely related or perhaps synonymous with P.
pertexta, but differs in having a deep reddish brown, K+ purple hypothecium.
According to SWINSCOW & KROG (1981), the hypothecium of P. pertexta is
colourless, but the present examination of the West Indian material showed patchy
occurrences of a red, K+ purple pigment in the hypothecium of older apothecia of
P. pertexta.
According to EKMAN (1996), Bacidia prasinata (Tuck.) Coppins is a later
synonym of P. pertexta. That species was described on material from Venezuela
(not seen by me) and is the holotype of the genus Sporacestra A. Massal. If the
current broad concept of Phyllopsora is adopted, the name Phyllopsora (priority
1894) should be conserved against both Sporacestra (priority 1860) and Triclinum
Fée (priority 1825; see TIMDAL 2008b).
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