Dryopteris rheophila Mitsuta ex Darnaedi M.Kato & K.Iwats.
Dryopteris rheophila Mitsuta ex Darnaedi, M.Kato & K.Iwats., J. Jap. Bot. 64: 302. 1989; Tagawa & K.Iwats., Fl. Thailand 3: 620. 1989; Boonkerd & Pollawatn, Pterid. Thailand: 205. 2000.
Rhizome erect; rhizome scales persistent, dull brown, ovate, lip to 7 by 4 mm. Stipes 10–40 cm long; laminae oblong-lanceolate to narrowly deltoid-ovate, bipinnate to obscurely tripinnatifid, 17–43 by 7–18 cm; pinnae inserted at angles less than 50° to rachis, middle pinnae oblong, broadest at base, acuminate towards apex, 5–11 by 2–3 cm; pinnules oblong, unequally cuneate at base, obtuse at apex, shallowly lobed, each lobe with a short sharp tooth. Sori medial on acroscopic veinlets, distributed throughout lamina; chromosome number n = 82, 2n 164 (tetraploid</A>); reproduction sexual.
Distribution in Thailand
Endemic to Thailand.
On sandstone boulders in streamlet at 1000–1200 m alt.
Dryopteris sparsa (D.Don) Kuntze
Proposed IUCN Conservation Assessment
Data Deficient (DD). This species is only known from Phu Kradueng in Loei Province. The overall distribution of the species there, and the health of the population, requires further research to provide a conservation assessment.
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