Diplazium muricatum (Mett.) Alderwerelt (1909: 829)

Pongkai, Puttamon, Zhang, Li-Bing, Boonkerd, Thaweesakdi & Pollawatn, Rossarin, 2023, Revision of the fern genus Diplazium (Polypodiales: Athyriaceae) in Thailand, Phytotaxa 631 (1), pp. 1-69 : 35

15. Diplazium muricatum (Mett.) Alderwerelt (1909: 829) . Fig. 18 .

Asplenium muricatum Mettenius (1866: 239) .

Type : INDONESIA. Zipple s.n. (holotype L; fragment B 20 0028987!) .

Plants terrestrial. Stems assending, 5–8 cm diameter, densely scaly on apical part; scales 12–18 × 1–2 mm, linear, concolorous, brown, margin minutely toothed. Fronds 1.0– 1.8 m, bipinnate; petioles 0.8–1.0 m, 1.0– 1.5 cm diameter, deep green, densely scaly and dark at base. Laminae 60–80 × 50–70 cm, bipinnate-tripinnatifid, subdeltoid in outline, gradually narrowing towards apex, glabrous, papyraceous, light green; pinnae 9 pairs, alternate, lower pinnae 27– 34 × 18–23 cm, oblong in outline, apex acuminate, stalked; stalks 4–5 cm; pinnules 9–10 × 2.0– 2.5 cm, alternate, oblong, apex acuminate, base subtruncate, margin lobed, lobes nearly to costule, 10–12 × 3–4 mm, oblong, apex round, margin sharply serrate, stalked; stalks 2 mm; veins pinnate, veinlet 7–8 pairs, free, forked. Sori 2–3 mm, oblong, close to midrib, rarely diplazoid, indusiate; indusia thin, fragile. Spores monolete, 32.5–40.0 × 22.5–27.5 μm, bilateral, concavo-convex to plano-convex, perispore present; ornamentation: prominent wing folds.

Thailand: —NORTHERN: Chiang Mai (Doi Chiang Dao, Doi Inthanon) , Chiang Rai (Khunkorn waterfalls) , Nan (Doi Phuka) , Phitsanulok ( Phu Hin Rong kla) ; SOUTH-WESTERN: Kanchanaburi.

Distribution: — India, Burma, and Indonesia.

Ecology: —On moist mountain slopes in dense forests at 1,000–2,000 m elev.

Specimens Examined:— THAILAND. Chiang Mai, Chiang Dao, C. Chermsirivathana 329 (BK); Chiang Mai, Doi Chiang Dao, C.F. van Beusekom & C. Phengklai 1319 (L); Kanchanaburi, C.F. van Beusekom & C. Phengklai 219 (L); Chiang Mai, Doi Chiang Dao, E. Hinnapman 3230 (L); Nakhon Sawan, Doi Musue, E. Hinnapman 3241 (L); Chiang Mai, Doi Chiang Dao, E. Hinnapman 3259 (B, BM); ibis., E. Hinnapman 3260 (L); Chiang Mai, Doi Chiang Dao, E.C. & C.H. 329 (BKF); Chang Rai, Mae Sai, J.F. Maxwell 04-658 (L); Nan, Doi Phu Kah, J.F. Maxwell 94- 799 (L); Chiang Mai, Doi Inthanon, M. Tagawa , K. Iwatsuki & N. Fukuoka T2656 (L); Nan, Doi Phuka, P. Pongkai 11 (BCU); Phitsanulok, Phu Hin Rong kla, P. Pongkai 12 (BCU); Nan, Doi Phuka, P. Pongkai 7 (BCU); Chiang Rai, Khunkorn waterfalls, P. Ratchata 137 (BCU); Chiang Rai, Khunkorn waterfalls, P. Ratchata 142 (BCU); Chiang Rai, Khunkorn waterfalls, P.Ratchata 216 (BCU); Chiang Rai, Khunkorn waterfalls, P.Ratchata 49 (BCU). PHILIPPINES. Mindanao, R.S. Williams 2458 (K).

We here followed Fraser-Jenkins et al. (2018) and removed the distribution of this species in southern India and Sri Lanka where the relevant species is described as D. manickamii Fraser-Jenk. & Kholia in Fraser-Jenkins et al. (2018: 126).

Figures

FIGURE 18. Diplazium muricatum (Mett.) Alderw. A, pinna. B, a part of pinnule with sori. C, scale showing toothed and not black marginal cells. P. Pongkai 12 (BCU).