Leucodermia boryi (Fée) Kalb 2015

Mongkolsuk, Pachara, Meesim, Sanya, Poengsungnoen, Vasun, Buaruang, Kawinnat, Schumm, Felix & Kalb, Klaus, 2015, The lichen family Physciaceae in Thailand-II. Contributions to the genus Heterodermia sensu lato, Phytotaxa 235 (1), pp. 448-450 : 448-450

2. Leucodermia boryi (Fée) Kalb , comb. nov. ( Fig. 10A )

Mycobank MB 813828

Basionym: Borrera boryi Fée, Essai Cryptog. Écorc. Exot. Officin. Introd. XCVI et tab. II, fig. 23 (1825) and Essai Cryptog. Écorc. Exot. Officin., Suppl. 148 (1837); Anaptychia boryi (Fée) A. Massal., Mem. Lichenogr. 41 (1853). Type:— ÎLE BOURBON [Réunion], A.L.A. Fée s.n.; (syntype PC n.v., fide Swinscow & Krog 1976: 124); Anaptychia neoleucomelaena Kurok., J. Jap. Bot. 36: 51 (1961); Heterodermia neoleucomelaena (Kurok.) Follmann & Redón, Willdenowia 6: 446 (1972). Type:— INDIA. below Jamunotri Tehri Garhwal, 9000–9500 ft, on tree trunks, 6 June 1951, D.D. Awasthi 902; (holotype LWG-LWU n.v.); Heterodermia boryi (Fée) K.P. Singh & S.R. Singh, Geophytology 6: 33 (1976).

For further synonymy, see Kurokawa (1998).

Thallus foliose to subfruticose, often in loose rosettes or forming tangled mats, loosely adnate or, in part, unattached, 5–15 cm wide. Lobes 0.4–3.0 mm wide, separate, ± plane, linear-elongate, ribbon-like, tangled, dichotomously branched, often ascending at the apices or, occasionally, the apices reflexed or with circinately revolute tips to the distal lobes, with conspicuous gray to black simple or sparingly branched marginal rhizines, 5–15 mm long. Upper surface ivory to gray-white, smooth. Medulla white. Lower surface mostly ecorticate, canaliculate, arachnoid or powdery, but not sorediate, white throughout or partially pinkish brown or rarely purple; yellow pigments absent; lower margins thickened, corticated. Apothecia ± common, subapical to apical, substipitate to distinctly stipitate, 1–5 mm wide; margin crenulate to lobulate, lobules triangular, to 2 mm long, often with sparse short black cilia; disc concave, dark brown, ± distinctly white-pruinose. Ascospores Polyblastidia - type, ellipsoidal, with numerous small and/or large sporoblastidia, 35–53 × 18–25 µm. Pycnidia rare, immersed, visible as black dots; conidia bacilliform, 4–5 × 1 µm.

Chemistry: Cortex K+ yellow, C–, KC–, P+ yellow; medulla K+ yellow, C–, P– or P+ pale yellow; containing atranorin (major), zeorin (major) and japonene (minor or trace).

Distribution and habitat:—This species occurs on bark and more rarely on mossy rocks in hill evergreen forest and lower montane forest; it is widespread in tropical to warm temperate regions.

34 • Phytotaxa 235 (1) © 2015 Magnolia Press

MONGKOLSUK ET AL.

Remarks: —Although we have not studied the type of this species, we were able to investigate specimens which were collected recently by the authors in Réunion (type locality). They agree very well with the clear drawings published in Fée (1825, Tab. 2, Fig. 23). Heterodermia boryi is distinguished by the tangled mass of rather narrow, elongate, linear lobes having long black marginal cilia; a largely ecorticate lower surface and thickened, corticate margins. The type is fertile and esorediate, but without a molecular investigation it is not possible to decide whether the sorediate specimens deserve taxonomic recognition.

Material from Thailand examined:— Chiang Mai: Doi Inthanon National Park, along trail Ang Ka Doi Inthanon,

in hill evergreen forest, on bark of unidentified tree, 2240 m, 18°48'27'' N, 98°53'77'' E, 30 April 2005, W .

Hongsachart, WD 116, ( RAMK 21732); Phitsanulok: Phu Hin Rong Kla National Park, along trail area the Tub

Boek, in lower montane forest, on bark of unidentified tree, 1595 m, 16°55'33'' N, 101°05'58'' E, 1 April 2004, T .

Diagsa, RU-TD 23, ( RAMK 21730); ibid., S. Meesim RU-MS 40/8, ( RAMK 21717).

Figures

FIGURE 10. A. Leucodermia boryi, fertile specimen (scale 5 mm). B. Leucodermia leucomelos, sorediate specimen (scale 5 mm). C. Polyblastidium appendiculatum (scale 5 mm). D. Polyblastidium fragilissimum (scale 5 mm). E. Polyblastidium hypocaesium (scale 5 mm). F. Polyblastidium hypoleucum (scale 5 mm).