Drynaria bonii Christ
Named after Henry Francois Bon who collected the type specimen of Drynaria bonii in Vietnam in 1886.
Drynaria bonii Christ, Not. Syst. 1: 186. 1910; Tardieu & C.Chr., Fl. Indo-Chine 7(2): 517, f. 61. l & 61.2. 1941; Holttum, Dansk Bot. Ark. 20: 20. 1961; Holttum, Dansk Bot. Ark. 23: 231. 1965; Tagawa, J. Jap. Bot. 38: 329. 1963; Tagawa & K.Iwats., SouthE. Asian Stud. 5: 58. 1967; Tagawa & K.Iwats., Fl. Thailand 3: 545. 1989; Hovenkamp & Roos, Fl. Males., Ser. II, Ferns and Fern Allies 3: 36. 1998; Boonkerd & Pollawatn, Pterid. Thailand: 249, 268. 2000; Newman et al., Checkl. Vasc. Pl. Lao PDR: 29. 2007. – Type: Bon 3204 (P), Tonkin.
Rhizome short creeping, tightly fixed on substrate, sometimes very flat, 1–2.5 cm wide, 3–5 mm thick, densely scaly; scales oval with long tails, peltate, round at base, up to 2.5 mm long with tails of about 2 mm in length, 1.5 mm broad, sharply toothed to fimbriate at margin, bi-coloured with black brown small central portion and brown margin. Nest-leaves many, imbricate, covering rhizome almost entirely, oval in outline, deeply cordate at base, subentire, 5–10 by 4.5–7 cm. Foliage-leaves: stipes stramineous, 10–25 cm long, narrowly winged almost to the base, scaly at base; laminae pinnatifid nearly to rachis, decurrent laminae less than 5 mm in breadth, 30–55 by 20–40 cm; lobes more or less ascending, oblanceolate or oblong-lanceolate, moderately acute to caudately acuminate, 10–22 by up to 3.8 cm, subentire, more or less narrowed towards base; veins distinct on both surfaces, finely anastomosing with 4–6 rows of areoles between main veins; chartaceous, light green, glabrous. Sori round or punctiform, in 2–4 irregular rows between main veins.
Distribution in Thailand
NORTHERN: Mae Hong Son, Chiang Mai, Chiang Rai, Lampang, Phrae, Tak, Phitsanulok; NORTH-EASTERN: Loei, Nong Khai; EASTERN: Chaiyaphum, Nakhon Ratchasima; SOUTH-WESTERN: Uthai Thani, Kanchanaburi, Prachuap Khiri Khan; CENTRAL: Sing Buri, Saraburi; SOUTH-EASTERN: Prachin Buri, Chon Buri.
Distribution in Laos
Distribution in Cambodia
Pursat, Siem Reap, Takeo
China (Guizhou) and Indochina.
Proposed IUCN Conservation Assessment
Least Concern (LC). This species is widespread and not under any known threat.
Voucher specimens - Thailand
Middleton et al. 5133, Loei, Phu Suan Sai, Tat Huang waterfall (E).
Voucher specimens - Laos
Maxwell 98-877, Champasak (CMU)
Voucher specimens - Cambodia
Long et al. CL225, Siem Reap (P).
Cross section of rhizome
Young nest leaves
Old dry nest leaves
Growing tip and young scales
Frond upper surface
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