Taxon Profile:

	The Plant List
	International Plant Name Index
	Tropicos
	Catalogue of Life
	Global Biodiversity Information Facility
	JSTOR Types
	JSTOR
	BHL
	Encyclopedia of Life
	WikiSpecies
	Google Scholar
	PubMed
	Morphbank
	IUCN
	National Center for Biotechnology Information
	Barcode of Life

Family:

Dryopteridaceae (Pteridophyta)

Primary Citation:

Amer. Fern J. 99: 11-12, Figs. 2B, 7F, 11F–K. 2009

Accepted Name:

This name is currently accepted.

Type Specimens:

Specimen 1: Holotype -- T. Rojas
Specimen 2: Isotype -- T. Rojas

Description:

by: R.C. Moran, J. Prado, and P.H. Labiak

Type: Paraguay. Amambay: Sierra de Amambay [ca. 23º00'S, 58º00'W, 300 m], Sep 1907, Hassler 10802 (holotype: NY; isotypes: K, MICH).

Description: Leaves ca. 1.0 m long; scales of petiole bases ca. 2 × 0.15 cm, linear to lanceolate, sparsely denticulate, light brown to yellowish or golden, twisted or crispate, en masse forming a dense wool; laminae ca. 75 cm long, to 3-pinnate-pinnatifid at base, 2-pinnate medially; basal pinnae ca. 30-50 cm long, stalks to 2 cm long, strongly inequilateral, pinnules acroscopically slightly reduced toward the base of pinna; pinna rachises abaxially non-glandular, glabrous or nearly so, with a few (usually at pinna base) scales, these 2.5 mm long, linear, denticulate, adaxially densely pubescent, non-glandular, hairs 0.1-0.3 mm long, 1-4-celled; costules abaxially non-glandular, pubescent to lacking hairs, sparsely scaly, hairs 0.2-0.4 mm long, 2-4-celled, scales 1-2 mm long, filiform to narrowly lanceolate, non-bullate, adaxially pubescent, hairs 0.1-0.6 mm long, 3-5-celled; laminar tissue between veins abaxially non-glandular, puberulent, hairs ca. 1 mm, 1-celled, erect to substrigose, sometimes with sparse uniseriate scales, these ca. 0.2 mm long, appressed, brown, glabrous adaxially; veins adaxially pubescent, visible, abaxially pubescent, hairs 0.2-0.3 mm long, 1-3-celled, with sparse uniseriate, filiform scales, these ca. 0.2 mm long, appressed, brown; lamina margins non-glandular, sparsely ciliate, hairs ca. 0.1-0.2 mm long, 1(2)-celled; indusia absent.

Distribution: Brazil, E Paraguay; [200-300 m].

Comments: Megalastrum brevipubens is distinctive by the short (ca. 0.1-0.2 mm long), erect, acicular hairs between the veins on the abaxial surfaces of the laminae. It resembles M. connexum, a species that is glabrous between the veins abaxially.