Nephromopsis togashii (Asahina) A. Thell & Kärnefelt
Nomenclatural data
Mycol. Progress 4(4): 311, 2005.
Basionym: Cetraria (Platysma) togashii Asahina. J. Jap. Bot. 28: 136, 1953. Type: Japan. Honshu, Prov. Suruga, Gotemba-machi, 14 April 1952, Y. Asahina & M. Togashii no. 28810 (TNS!, lectotype). – Tuckneraria togashii (Asahina) Randlane & A. Thell, J. Hatt. Bot. Lab. 78: 238–242, 1995
Morphology
Thallus up to 10 cm across with rather short, rounded, concave lobes, 2–5 mm broad; upper surface yellow; lower surface pale brown to yellowish white; isidia frequent, branched, mainly marginal but occasionally also laminal, coralloid; pseudocyphellae rare, plane and white, located on the lower surface; rhizines 1–2 mm long, dark yellow to blackish; cilia sparse, light yellow; upper cortex 15–25 µm thick,crystallized, composed of 2–4 layers of rounded, rather gelatinized cells, up to 5 µm in diam.; medullary hyphae 3–4 µm; lower cortex 10–20 µm thick, composed of 2–3 layers of strongly gelatinized, rounded cells.
Apothecia rare, with a marginal position and a brown convex surface, up to c. 4 mm in diam.; hymenium and subhymenium together 45–50 µm; exciple two-layered, upper layer strongly gelatinized with longitudinally arranged hyphae, c. 30 µm high, lower layer paraplectenchymatous 30–50 µm; asci c. 40 x 12 µm, eight-spored, axial body c. 3 µm; spores globose to subglobose, usually uniseriately arranged, 5–6 x 4–5 μm; paraphyses c. 2 µm broad, straight, unbranched, with the lumina partly hollow; pycnidia frequent, sphaerical or subsphaerical, black coloured, up to c. 120 µm in diam., slightly emergent or on black projections on the margins of the thallus or apically on the isidia; pycnoconidia rare, slightly bifusiform (dumb-bell shaped), 3.7–4.5 x 1.0–1.5 µm.
Chemistry
Cortex K–, KC+ yellow (usnic acid); medulla K–, C–, KC–, Pd– (protolichesterinic acid).
Remarks
Shape of ascospores (globose to subglobose), presence of cilia, although sparse, and pseudocyphellae on the lower side were the main reasons for placing this isidiate species in Tuckneraria (Thell et al. 1995). However, a position in the proposed wider circumscription of Nephromopsis is presumably the best destination for the species.
Ecology and distribution
Grows on deciduous and coniferous trees. Originally it was described as a Japanese endemic, but it has since been found in China and Taiwan (Wei 1991).
Literature
Randlane, T. & Saag, A. 1992. | Randlane, T. & Saag, A. 1998. |Randlane, T. & Saag, A. 2004. | Randlane, T., Saag, A. & Obermayer, W. 2001. | Randlane, T., Saag, A., Thell, A. & Kärnefelt, I. 1994. | Randlane, T., Thell, A., & Saag, A. 1995. | Thell, A., Randlane, T., Saag, A. & Kärnefelt, I. 2005.
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