Cyclosorus subpubescens (Blume) Ching

Family

Thelypteridaceae

Nomenclature

Cyclosorus subpubescens (Blume) Ching, Bull. Fan Mem. Inst. Biol. 8: 21. 1938; Holttum, Rev. Fl. Malaya ed. 1, 2: 273, f. 157. 1955 [‘1954’]. – Aspidium subpubescens Blume, Enum. Pl. Javae.: 149. 1828. – Cyclosorus parasiticus var. subpubescens (Blume) Tardieu & C.Chr., Notul. Syst. 7: 78. 1938; Tardieu & C.Chr., Fl. Indo-Chine 7(2): 382. 1941; Seidenf., Nat. Hist. Bull. Siam Soc. 19: 86. 1958. – Thelypteris subpubescens (Blume) K.Iwats., Mem. Coll. Sci. Univ. Kyoto B. 31: 173. 1965; Tagawa & K.Iwats., SouthE. Asian Stud. 5: 65. 1967; Tagawa & K.Iwats., Fl. Thailand 3: 428. 1988. – Christella subpubescens (Blume) Holttum, Kew Bull. 31: 323. 1976; Holttum, Fl. Males., Ser. II, Pterid. 1: 558, f. 20g. 1982 [‘1981’]; Boonkerd & Pollawatn, Pterid. Thailand: 222. 2000. – Type: Blume, Java, river bank at Tanjong Krukot, Batavia (L, sheet 910,327-113, large sheet collection).

Aspidium molle var. latipinna Benth., Fl. Hongk. 455. 1861. – Nephrodium latipinna (Benth.) Hook., Syn. Fil.: 292. 1867. – Dryopteris latipinna (Benth.) Kuntze, Rev. Gen, pl. 2: 813. 1891; C.Chr., Bot. Tidsskr. 32: 342. 1916. – Cyclosorus latipinnus (Benth.) Tardieu, Notul. Syst. 7: 73. 1938; Tardieu & C.Chr., Fl. Indo-Chine 7(2): 397. 1941; Holttum, Rev. Fl. Malaya ed. 1, 2: 276, f. 159. 1955 [‘1954’]. – Thelypteris latipinna (Benth.) K.Iwats., Acta Phytotax. Geobot. 23: 166. 1965; Tagawa & K.Iwats., SouthE. Asian Stud. 5: 66. 1967; Tagawa & K.Iwats., Fl. Thailand 3: 427. 1988. – Christella latipinna (Benth.) H.Lév., Fl. Kouy-Tcheou: 475. 1915; Boonkerd & Pollawatn, Pterid. Thailand: 220. 2000.

Dryopteris sumatrana Alderw., Handb.: 227. 1908. – Cyclosorus sumatranus (Alderw.) Ching, Bull. Fan Mem. Inst. Biol. 10: 249. 1941; Holttum, Rev. Fl. Malaya ed. 1, 2: 275, f. 158. 1955 [‘1954’]; Holttum, Dansk Bot. Ark. 23: 233. 1965. – Thelypteris sumatrana (Alderw.) K.Iwats., Acta Phytotax. Geobot. 22: 101. 1976; Tagawa & K.Iwats., SouthE. Asian Stud. 5: 66. 1967; Tagawa & K.Iwats., Fl. Thailand 3: 429. 1988.

Description

Rhizome suberect or short to long creeping, up to 1 cm diam; scales dark brown, up to 5 by 0.8 mm, hairy. Stipes 5.5–37 cm long, hairy throughout. Laminae oblong-lanceolate to elliptic, 8–12 pairs of free lateral pinnae, a long narrowly triangular terminal pinna up to 18.5 by 3.5 cm, longer than the lateral pinnae, acute at apex; laminae 13–75 by 6–19.5(–35) cm; pinnae 4–12 pairs, lower lateral pinnae reduced, lower ones remote, very small, butterfly-shaped or mere auricles, middle larger pinnae shortly stalked or subsessile, ascending, linear-lanceolate, gradually narrowing towards long-acuminate apex, broadly cuneate to subtruncate at base, 2.9–10.5(–20) by 0.7–2.7 cm, shallowly lobed about 1/4 way to costa; segments oblique, round at apex, papyraceous, glabrous to densely pubescent on lower surface; venation goniopteroid, basal 2 to 3 pairs anastomosing. Sori medial; indusia rather large, persistent, glabrous or sparsely hairy .

Distribution in Thailand

NORTHERN: Chiang Mai, Chiang Rai, Lampang; NORTH-EASTERN: Nong Khai; SOUTH-WESTERN: Kanchanaburi, Prachuap Khiri Khan; CENTRAL: Saraburi, Nakhon Nayok; SOUTH-EASTERN: Prachin Buri, Chon Buri, Chanthaburi, Trat; PENINSULAR: Chumphon, Surat Thani, Phangnga, Nakhon Si Thammarat, Trang, Satun.

Distribution in Cambodia

Kompong Speu.

Wider Distribution

Tropical Asia to Australia (Queensland), north to S Japan.

Ecology

On rather dry or humus-rich mountain-slopes in forests at low to medium altitudes.

Proposed IUCN Conservation Assessment

Least Concern (LC). This species is widespread and not under any known threat.

Notes

We have seen no sporangia with hairs but Holttum reports that some specimens have capitate hairs on the sporangia .

Voucher specimens - Thailand

Middleton et al. 4636, Trat, Namtok Khlong Kaeo National Park (E); Middleton et al. 5543, Nakhon Si Thammarat, Namtok Si Khit National Park (E).

Voucher specimens - Cambodia

Pierre s.n., Kompong Speu, Knang Krepeu (P).

Habit

Habit

Habit

Habit

Rhizome

Rhizome

Crozier

Crozier

Apex of frond

Apex of frond

Reduced basal pinnae

Reduced basal pinnae

Terminal pinna

Terminal pinna

Upper surface of rachis and pinnae

Upper surface of rachis and pinnae

Upper surface of lamina

Upper surface of lamina

Upper surface of lamina

Upper surface of lamina

Pinna from above

Pinna from above

Pinnae from beneath

Pinnae from beneath

Venation and position of sori on veins

Venation and position of sori on veins

Lower surface of lamina

Lower surface of lamina

Lower surface of rachis and pinnae

Lower surface of rachis and pinnae

Sori

Sori

Sori

Sori

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