Ramonia minima J. Kalb & Kalb, 2017
publication ID |
https://doi.org/ 10.11646/phytotaxa.332.2.2 |
persistent identifier |
https://treatment.plazi.org/id/641D87E9-2244-FFDD-2E92-FD006C3AF9C2 |
treatment provided by |
Felipe |
scientific name |
Ramonia minima J. Kalb & Kalb |
status |
sp. nov. |
Ramonia minima J. Kalb & Kalb View in CoL , sp. nov. ( Figs. 3B, 3C View FIGURE 3 )
Mycobank MB823631 Similar to R. kandleri Kalb , but differs in having smaller apothecia, a lower hymenium and a partly brown to blackish exciple. Type:— THAILAND. Ratchaburi province: Suan Phueng district ; tambon Suan Phueng, trail to Kaew Chan Waterfall (Nine-Level
Waterfall), bamboo scrub with scattered deciduous trees along a creek (mixed deciduous forest), 200–250 m, 13°31’31’’ N, 99°14’23’’
E, 11 December 2015, J. Sutjaritturakan & K. Kalb 41276 (RAMK, holotype).
Etymology:—The species name refers to the very small apothecia.
Thallus corticolous, crustose, grey, thin, smooth, ecorticate, dull, up to 1.5 cm in diam. Photobiont trentepohlioid, cells ± spherical, ca. 7–10 μm in diam. Apothecia scattered, pale flesh-coloured, globular, 0.1–0.2 mm in diam., at first immersed in the thallus and substrate, later erumpent and semi-immersed; ostiole roundish, 25–50 μm in diam., with a star-like margin composed of 6–10 recurved, white triangular lobules. Exciple paraplectenchymatous, inner part hyaline, outer part brownish to brownish black, 30–50 μm thick, upper part with 10–25 μm long periphyses ( Fig. 3C View FIGURE 3 ). Hymenium clear (not inspersed), hyaline, 90–110 μm high. Paraphyses unbranched, 2–2.5 μm thick, endcell up to 3 μm thick. Asci clavate, 65–80 × 10–15 μm with 32–64 ascospores; ascospores hyaline, non-septate, broadly ellipsoid to narrowly ellipsoid or drop-shaped ( Fig. 3C View FIGURE 3 ), 6–9 × 3–5 μm (excluding halo), halonate, halo 1–2 μm thick. Pycnidia not seen.
Distribution and habitat:— Thailand. At present known from the type locality, where R. minima grows on bark of a deciduous tree in a mixed deciduous forest between 200– 300 m. Growing together are Coenogonium verrucimarginatum J. Kalb & Kalb ( Kalb et al. 2016) and Bacidia medialis (Tuck.) Zahlbr. A photograph of the typelocality is published in Kalb et al. (2016: 103, Fig. 2 View FIGURE 2 ).
Remarks:—With the partly dark exciple, the ellipsoid to ovoid spores and the star-like margin of the ostiole, R. minima is intermediate between section Ramonia (type species R. valenzueliana ) and section Gyalenidium (type species R. malmei ) as distinguished by Vězda (1966). There are only two species known with non-septate ascospores broader than 3 μm, viz. R. intermedia Kalb and R. kandleri Kalb ( Kalb 1983; Aptroot et al. 2015). R. minima can be distinguished from R. intermedia by its larger ascospores (4–6 × 3 μm in R. intermedia ) and from R. kandleri by the smaller apothecia (0.2–0.6 mm in R. kandleri ), lower hymenium (200 μm high in R. kandleri ) and a partly brown to blackish exciple (hyaline in R. kandleri ).
The genus Ramonia is a new addition to the Thai lichen biota.
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