Christensenia aesculifolia (Blume) Maxon
Christensenia aesculifolia (Blume) Maxon, Proc. Biol. Soc. Washington 18: 240. 1905; Holttum, Rev. Fl. Malaya ed. 1, 2: 45, f. 4. 1955 [‘1954’]; Tagawa & K.Iwats., Acta Phytotax. Geobot. 23: 110. 1968; Tagawa & K.Iwats., Fl. Thailand 3: 43. 1979; Boonkerd & Pollawatn, Pterid. Thailand: 64. 2000. – Aspidium aesculifolium Blume, Enum. Pl. Javae.: 143. 1828. – Kaulfusia aesculifolia Blume, Enum. Pl. Javae. 260. 1828; Bedd., Handb. Ferns Brit. India: 462, f. 287. 1883.
Christensenia assamica (Griff.) Ching, Acta Phytotax. Sin. 7: 202. 1958; Fl. Reipubl. Popularis Sin. 2: 65, pl. 3, f. 7–10. 1959.
Rhizome short creeping, fleshy, bearing a few fronds at apex. Stipes green and fleshy, up to 60 cm long; laminae pedate with 3–5 leaflets; middle leaflets largest, elliptic, acute at apex, narrowly cuneate at base, up to 25 cm long, 8 cm broad, entire; the other lobes elliptic, smaller in size than the middle ones, sessile or very short stalked; costae and main lateral veins distinctly raised; veins copiously anastomosing, often with included free veinlets. Sori at vein junction, each consisting of a circular group of 10–20 sporangia joined together laterally, dehiscing inwards towards the central depression, in two or more irregular rows between the main veins.
Distribution in Thailand
PENINSULAR: Phangnga, Nakhon Si Thammarat.
India (Assam) to Java, not recorded from Cambodia, Laos or Vietnam.
On moist sandy slopes near streams in dense moist evergreen forest at about 800 m alt.
Proposed IUCN Conservation Assessment
Least Concern (LC). This species is widespread and not under any immediate known threat although has only rarely been recorded in Thailand.
Voucher specimens - ThailandMiddleton et al. 5448, Phangnga, Sra Nang Manora Forest Park (E).
Upper and lower frond surfaces
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