Volume 3 > Part 1 > Year 1979 > Page 5–6 > Psilotaceae > Psilotum

1. Psilotum nudum (L.) P.Beauv.wfo-0001109597

Prod. Aethéog.: 112. 1805; Tagawa & K.Iwats., Southeast As. St. 5: 26. 1976.— Lycopodium nudum L., Sp. Pl.: 1100. 1753.

Accepted Name : This is currently accepted.

Synonyms & Citations :

Description : Rhizome creeping , dichotomously branching at irregular intervals, 0.5–1.5 mm in diameter, densely beset with brown to dark brown rhizoids. Aerial stems fasciculate, erect, patent , or pendulous, 10–60 cm in height, green, glabrous, dichotomously branching several times in upper portion, grooved, with several distinct ridges 0.5–1.5 mm in diameter. Scaly projections small, to 1 mm long, oval with subulate apex, irregularly and sparsely borne on ridges. Synangia borne adaxially to the projections, glabrous, about 2 mm in diameter, green at first, yellow when mature, with lemon-yellow or paler spores.

Thailand : NORTHERN: Chaing Rai, Chaing Mai (Mae Rim, Doi Inthanon, Om Koi), Tak (Lan Sang); NORTH-EASTERN: Loei (Wang Saphung), Khon Kaen (Phu Wieng); CENTRAL: Nakhon Nayok (Khao Yai); SOUTH-EASTERN: Chon Buri (Si Racha), Chanthaburi (Pong Nam Ron, Soi Dao); SOUTH-WESTERN: Kanchanaburi (Ban Kaeng Liang), Prachuap Khiri Khan (Huai Yang); PENINSULAR: Chumphon (Ko Wieng, Bang Son), Surat Thani (Ko Pha-ngan), Nakhon Si Thammarat (Khao Luang).

Distribution : Tropics and subtropics throughout the world (type from India), north to Quelpart.

Ecology : Usually epiphytic on mossy tree-trunks in dense forests or in light shade at low to medium altitudes.

E-version notes : For more details see Ferns of Thailand, Laos and Cambodia.