TWO NEW SPECIES OF FERNS FROM THAILAND (S. LINDSAY, D. J. MIDDLETON & S. SUDDEE)
Map 1. Distribution of Cyclosorus thailandicus S.Linds. (S) and Tectaria phanomensis S.Linds. (z).
Tectaria phanomensis S.Linds., sp. nov. Caudex ascendens. Stipes usque 48.5 cm longus. Lamina usque 63 x 65 cm, pinnae ca 8-jugatae. Typus: Thailand, Surat Thani [Amphoe Phanom, Khlong Phanom National Park, trail from headquarters around base of limestone mountain, 8°53’N, 98°41’E, 11 April 2003, Middleton, Lindsay & Pooma 2140 (holotype BKF; isotype A)]. Map 1.
Fern growing in limestone crevice with ascending rhizome; rhizome densely covered in scales. Scales yellow-brown, widest at base, to 15 x 1.25 mm, thin, brittle, crisped, composed of long cells, with long slender twisted tip, margins entire. Stipe 40–48.5 cm long, 4 mm diameter, brown beneath, green above, scales dense near base, scattered to half way up stipe. Lamina triangular, to 63 x 65 cm, with ca 8 pairs of free pinnae and terminal section with gradually reducing pinnae decurrent into neighbour; basal pinna largest, stalked, 34– 36 x 20–21 cm, strongly asymmetrical, basiscopic pinnules enlarged, with first 4–5 basiscopic pinnules much longer than corresponding acroscopic pinnules, first acroscopic pinnule sessile, 1.5–2 cm from rachis, first basiscopic pinnule with short stalk, 2.1–3.3 cm from