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Rentep fern (Drynaria propinqua)

Dlium Rentep fern (Drynaria propinqua)

Rentep fern (Drynaria propinqua) is a plant species in Polypodiaceae, epiphytes, growing in sunny places, compound leaves with 6-18 minor leaves per strand, dark green and hard texture, smooth edges and orderly two linear sori under leaf.

D. propinqua have roots fibrous, adventitious and dark brown. Rhizome long creeping, up to 1 cm diameter, very densely scaly throughout. Scales persistent, narrowing from round peltate base to long-tailed apex, about 8 by 1.5 mm, pale brown with dark centre, the margin bearing long white downy hairs.



Nest-leaves sessile, ovate, about 20 cm in both length and width, deeply lobed more than half-way to midribs. Lobes narrowly subtriangular, acute at apex, entire, up to 7 by 2.5 cm, small scales with downy hairs more or less dense on main axes. Foliage-leaves stipes stramineous, up to 15 cm long, narrowly winged at least on the upper part.

Laminae oblong to oblong-lanceolate, up to 40 by 25 cm, deeply lobed almost to rachis, remaining wings of rachis less than 2 mm in breadth. Lobes 8-16 pairs, lanceolate, acute to acuminate at apex, slightly narrowing towards base, more or less ascending, up to 15 by 2.5 cm, entire.

Veins distinct on both surfaces, anastomosing, 2-4 rows of anastomosis between main veins, with included free veinlets, papyraceous, light green. Sori round, one row along each side and close to costa, one between adjacent main veins, a little raised on upper surface.

TAXON

Kingdom Plantae
Phylum: Tracheophyta
Class: Polypodiopsida
Subclass: Polypodiidae
Order: Polypodiales
Suborder: Polypodiineae
Family: Polypodiaceae
Subfamily: Drynarioideae
Genus: Drynaria (Bory) J.Sm. in J. Bot. (Hooker) 4: 60 (1841)
Species: Drynaria propinqua (Wall. ex Mett.) J.Sm. ex Bedd. in Ferns Brit. India: t. 160 (1866)

HOMOTYPIC SYNONYMS

Aglaomorpha propinqua (Wall. ex Mett.) Hovenkamp & S.Linds. in Gard. Bull. Singapore 69: 152 (2017)
Polypodium propinquum Wall. ex Mett. in Abh. Senckenberg. Naturf. Ges. 2: 120 (1856)

HETEROTYPIC SYNONYMS

Phymatodes arguta C.Presl in Tent. Pterid.: 197 (1836)
Phymatodes propinqua C.Presl in Tent. Pterid.: 198 (1836)
Phymatodes wallichiana C.Presl in Tent. Pterid.: 197 (1836)
Drynaria prolifera P.C.Pande & H.C.Pande in Ill. Fern Fl. Kumaon Himalaya 1: 56 (2003)
Drynaria propinqua var. mesosora Christ in Bull. Acad. Int. Géogr. Bot., sér. 3, 15: 108 (1906)
Pleopeltis inaequalis C.Presl in Tent. Pterid.: 193 (1836)
Polypodium dimorphum Zoll. in Syst. Verz. Ind. Archip. 1: 37, 48 (1854)
Polypodium faberi Christ in Mém. Soc. Bot. France 1: 17 (1905)

PUBLICATIONS

Fraser-Jenkins, C.R. & Kandel, D.R. (2020). Ferns and Fern-Allies of Nepal 3: 1-191. Government of Nepal, Ministry of Forests and Environment, Department of Plant Resources.

Newman, M., Ketphanh, S., Svengsuksa, B., Thomas, P., Sengdala, K., Lamxay, V. & Armstrong, K. (2007). A checklist of the vascular plants of Lao PDR: 1-394. Royal Botanic Gardens, Edinburgh.

Roskov Y. & al. (eds.) (2018). World Ferns: Checklist of Ferns and Lycophytes of the World. Species 2000 & ITIS Catalogue of Life Naturalis, Leiden, the Netherlands.

Singh, S.K. & al. (2023). Pteridophytes of Meghalaya. A pictorial guide: 1-246. Bishen Singh Mahendra Pal Singh.

VERNACULAR NAME

English: Rentep fern
Indonesia: Pakis rentep
Java: Rentep

Aryo Bandoro
Dlium TheDlium
YouTube: https://www.youtube.com/@Dlium
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