A Synopsis of the Genera Skyttea, Llimoniella and - Lichens of ...

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430 THE LICHENOLOGIST Vol. 32 100-150(-170) (im, superficial; asci 35-45 (im long; excipular hairs 7-5-10 (xm long; on Mycoblastus spp S. caesii Ascomatal margin thicker, 65-85 |im; pore 10-20% of the ascomatal diameter, when mature; ascomata 110-190 \im, immersed; asci 60-70 |xm long; excipular hairs 10-15 ^m long; on Ochrolechia rosella S. fusispora 7(4) Ascospores l-2(-2-5) nm wide; if ascospores up to 2-5 |xm, then excipular hairs 30-60 |im long, with a thick-walled and therefore refractive apex (cf. 5. hawksworthit) 8 Ascospores (2-)2-5-5 (xm wide; if excipular hairs longer than 30 \im, then apex not refractive 10 8(7) Ascomata 120-340 |xm; wall of excipular hairs apically not thickened, not appearing refractive; hairs 20-38 ^m long; ascospores 5-7 x 1-5-2 |o.m; on the thallus of cf. Micarea denigrata S. viridis Ascomata 75-175 \im; wall of excipular hairs apically thickened, appearing refractive 9 9(8) Excipular hairs 20-35 |xm long, not visible with a dissecting microscope; ascospores 6-7 (-7-5) x 1-5-2 \im; ascomata almost superficial when mature; on sterile thalli of Verrucaria nigrescens S. spinosa Excipular hairs 30-60(-80) (im long, easily visible with a dissecting microscope, and almost hiding the apothecia; ascospores 6-8(-10) x 2-2-5 |im; mature ascomata immersed; on Verrucaria sp S. hawksworthii 10(7) Ascospores 4-7 x 2-5-3-5(-4-5) |im; ascomata black, 100-225 \im; margin 50-60 jxm; on Buellia punctata S. buelliae Ascospores (6—)7—12 |xm long; if most ascospores 6-7 ^m long, then ascomatal margin thicker 11 11(10) Ascomata mostly 90-160 (im; ascomatal margin 30-50 (-5 5) (xm thick 12 Ascomata (125-) 150-225(-350) (im; ascomatal margin 45-125 |am thick 14 12(11) Ascospores 9-12(-16) x 3-5-5 jim; ascomata 100-140 |xm, margin 40-50 |im thick; excipular hairs 10-20 (im long; exciple partly with a brown, K+ violet pigment (reaction sometimes weak and difficult to observe); on Loxospora pustulata S. radiatilis Ascospores mostly 2-5-3-5 |im wide 13 13(12) Ascomatal opening (pore) c. 20% of the ascomatal diameter in mature ascomata; ascomata (75-)90-125(-150) |im; margin striate, often appearing whitish, mainly when young; lateral exciple 10-25 (im thick; excipular hairs 8-13 p.m long; hymenium 45-55 |j.m; asci 35-50 ^m; ascospores 7-9(-13) x (2-)3-3-5(-4-5) |xm; on Lecanora spp S. lecanorae
2000 Skyttea, Llimoniella and Rhymbocarpus—Diederich & Etayo 431 Ascomatal opening up to 50% of the ascomatal diameter; ascomata 125-160 urn (in elongate ascomata up to 200 um); margin not striate, not whitish (except the inner border of the margin); lateral exciple up to 55 um thick; excipular hairs 4-7 um long; hymenium 50-65 um; asci 45-60 um; ascospores 8-12 x 2-5-3 um; on Pyrenula S. pyrenulae 14(11) Ascomata often appearing cruciate, with 3-5 deep marginal fissures, blackish; margin 60-125 urn thick; pore in mature ascomata 25-50(-75) um; excipular hairs 20-50 um long; exciple of ± globose cells of 5-10 um; ascospores 6-5-8 x 3-3-5(-4) um; on Tephromela atra s. lat., T. tropica and an unidentified, crustose, saxicolous lichen {Tylothallia biformigera?) [rare specimens with ascomata not appearing cruciate may be identified using the other characters mentioned in this key] S. elachistophora Ascomatal margin entire, poorly or distinctly striate; fissures, if present, not deep, and more numerous (c. 5-10 per margin); excipular hairs 5-30 um long; exciple of smaller cells or of elongate interwoven hyphae 15 15(14) Ascospores narrowly ellipsoid, (7-5-)9-10(-ll) x (1-7-)2-3-3 um; ascomata blackish, but around the pore generally whitish; margin 45-60 um, striate, with numerous fissures, partly whitish; pore in mature ascomata 40-60% of the ascomatal diameter; excipular hairs up to 16 um long; exciple of globose to elongate cells of 4-8 um, without a brownish, K+ violet pigment; on Thelotrema lepadinum S. thelotrematis Ascospores at least 3 um wide; ascomatal margin never whitish; pore often smaller 16 16(15) Ascomatal margin 70-105 um thick; pore in mature ascomata 10- 30 um; basal exciple partly with a brown, K+ violet pigment (reaction sometimes weak and difficult to observe); ascomata black, in outline irregular due to numerous small marginal fissures; exciple of ± globose cells of 3-5-7 um; excipular hairs 15-30 um long; ascospores 6-12 x 3-4 um; on Pertusaria. . S. mayrhoferi Ascomatal margin 55-85 um thick; pore in mature ascomata 25- 50 um; basal exciple without a brown, K+ violet pigment; ascomata dark greyish, not black, in outline ± regularly circular; exciple of elongate, ± interwoven hyphae, 4-5 um thick and over 10 um long in microscopical section; excipular hairs 5-20 (am long; ascospores 7-8-5 x 3-3-5 um; on Mycoblastus fucatus (=M. sterilis) S. gregaria Skyttea buelliae Sherwood, D. Hawksw. & Coppins Trans. Br. mycol. Soc. 75: 483, (1981 ['1980']); type: Great Britain, V.C. 54, North Lincolnshire, near Wold Newton, on Ulmus, on Buettia punctata, vii 1976, Seaward (E—holotypus, non vid.). For a description and illustrations, see Sherwood et al. (1991).
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