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Xanthomendoza rosmarieae S. Y. Kondr. & Kärnefelt
Nomenclature
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Family: TeloschistaceaeGenus: Xanthomendoza
SUMMARY
Mycobank MB 517818
Thallus of numerous semierect, very narrow, richly branched and anastomosing, yellowish to whitish orange, sorediate lobes; soralia becoming isidiose, either marginal, of fallax-type, (0.2–)0.3–1(–1.2) mm long, or on the underside, of ulophyllodes-type, as a greenish spherical mass, (28–)35–50(–60) µm diam. Sometimes 2–3 soredia aggregated in irregular groups, to 90(–100) µm across, where true conblastidia are absent. Lobes mainly horizontally orientated and somewhat raised above the substrate; main lobes 2–2.5(–4) mm long and 0.1–0.2 mm wide, becoming narrower towards the tips, 0.4–0.5(–0.6) mm wide at the base, usually only 1 mm long fragments seen; secondary lobules ca. 0.1 mm wide throughout and 1–1.5 mm long; the total width of a lobe including secondary lobules are 2–2.5 mm. Rhizines variable in size but generally rather short, 0.05–)0.06–0.12 mm diam. and (0.2–)0.3–0.4(–0.5) mm long. Thallus in section (90–)110–120(–150) µm thick, upper cortical layer to 25(–30) µm thick, more or less mesodermatous paraplectenchymatous, lower cortical layer to 12(–30) µm thick, leptodermatous to mesodermatous paraplectenchymatous with vertically elongated cell lumina; algal layer 30–40 µm thick; medulla to 40–50(–70) µm thick, usually with a few scattered hyphae, sometimes with paraplectenchymatous parts, sometimes completely filled with algal clusters. Apothecia to 1.5(–2.2) mm diam., 0.35–0.4 mm high, lecanorine, thalline margin to 0.1–0.15(–0.2) mm wide; cortical layer on the underside 25–30(–40) µm thick, mesodermatous paraplectenchymatous; true exciple often indistinct or poorly developed, ‘textura intricata’;hymenium 70–90 µm high; subhymenium 20–30 µm thick; paraphyses ca. 2 µm diam. in lower portion, and to 4–5 µm diam. towards the tips, very often with oil droplets (better seen in K); asci 8-spored but often with 2–4–6 mature bipolar ascospores together with aborted two-celled spores; ascospores from elongated ellipsoid to broadly ellipsoid or ovoid with a wide septum; (8–)10–16 x 6–8(–11) µm in water and (10–)11–14(–16) x 7–10 µm in K, septum rather wide, (3–)5–8 µm wide in water and (4–)7–8 µm wide in K; spermogonia to 360 µm diam., punctiform, reddish; spermatia very narrow, bacilliform, 3.1–4.0 x 0.6–0.8 µm.