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

466 THE LICHENOLOGIST Vol. 32
Rhymbocarpus punctiformis Zopf, Hedwigia 35: 357 (1896); type: Italy, S. Tirol, St Ulrich in
Groden, on Rhizocarpon geographicum, viii 1895, Arnold (M—holotypus, vid.); ibid., 10 viii 1898,
Arnold Lichenes exs. 1772 (UPS—topotypus, vid.); ibid. ['Bolzano, Val Gardena (Grodner Tal),
Ortisei (St Ulrich), 2-2-2 km NEE of centre, road 242 Ponte Gardena (Waidbruck)—Ortisei'], on
R. geographicum, ix 1991, Triebel & Rambold 5968, 5969, 5973, 5974, 5975 (M—topotypi, vid.).
(Fig. IB)
For an illustration of the asci and ascospores, see Coppins et al. (1991).
Ascomata aggregated in decolourized or bullate areoles of the host, at first
immersed and ± perithecioid, becoming apothecioid when mature, normally
remaining immersed, even when mature, rarely slightly erumpent, black;
margin hardly visible, 50-120 (a.m diam. Exciple hyaline, except the upper part
close to the epihymenium, which is greenish brown, composed of several rows
of cells which are ± subglobose in the lower part and elongate in the upper
part, 10-15 urn thick at the base and up to 30 \im above; excipular hairs absent
or sparse, hyaline, tapered towards the apex, simple or with one septum.
Subhymenium and hymenium hyaline. Epihymenium brownish to greenish.
All parts KI — . Paraphyses simple to branched, hyaline, septate, slightly
swollen at the apices. Asci elongate clavate, with a single functional wall
layer, wall apically not thickened, I - and KI -, 8-spored. Ascospores
ellipsoid, straight or slightly curved, simple, hyaline, smooth, with obtuse
ends, 11-12 x 4-5 um.
Hosts. Rhizocarpon atroflavescens, R. geminatum and R. geographicum.
Distribution. Greece, Italy and Sweden.
Observations. The descriptions of R. geographici and R. punctiformis are
extremely close. As both taxa have been collected on the same host species,
they most probably represent the same species. As the type of Nesolechia
geographici is lost, we neotypify that name herewith on the type specimen of
Rhymbocarpus punctiformis to irrevocably fix the two names together.
Additional specimens examined. Sweden: Harjedalen, Tannas par., Mt Ashogen, southern slope,
950 m, on R. atroflavescens, 1975, Santesson 26333 (UPS); Torne Lappmark, the Tornetrask
Area, S of the railway station of Abisko, on R. geminatum, 1959, Santesson 13456a (UPS).
Rhymbocarpus makarovae Diederich & Etayo sp. nov.
Rhymbocarpus insignis ascomatibus immersis ad erumpentibus, atris, primo clausis, demum
aperientibus, 100-200 urn, margine glabro, 3-4 profundis fissuris diviso ubi vetere, ascosporis
ellipsoideis, aseptatis, 7-10 x 3-4 um.
Typus: Russia, eastern coast of Chukchi Peninsula, Lavrentiya Bay, near Cape Krauze, on
Porpidia sp., 10 July 1973, Makarova (LE—holotypus)
(Fig. 13)
Ascomata aggregated, immersed to erumpent, broadly attached to the
substratum, black, ± shiny, initially ± closed, 100-200 p.m diam.; margin,
when old, divided by 3-4 deep cruciately arranged fissures, without excipular