Nothoperanema (Tagawa) Ching

Roux, Jacobus P., 2011, The fern genera Dryopteris and Nothoperanema (Dryopteridaceae) in Madagascar and neighbouring Indian Ocean islands, including Saint Paul, Adansonia (3) 33 (1), pp. 7-67 : 60

Genus Nothoperanema (Tagawa) Ching

Acta Phytotaxonomica Sinica 11: 25 (1966). — Dryopteris Adans. subgen. Nothoperanema Tagawa, Acta Phytotaxonomica et Geobotanica 7: 199 (1938). — Type: Nothoperanema squamisetum (Hook.) Ching ; Nephrodium squamisetum Hook.

DESCRIPTION

Plants terrestrial or epilithic. Rhizome dictyostelic, suberect to erect. Fronds monomorphic, caespitose; stipe and rachis adaxially sulcate, sulcus open to that of the pinna-rachis; lamina pinnately compound, the basal pinna pair basiscopically developed; hypostomatic, stomata of the anomo- and polocytic types; venation of the pecopteridis-type, anadromous or catadromous, forked or pinnately branched, ultimate vein branches free, ending near the margin, the endings enlarged and often “hydathode”-like adaxially.Indumentum composed of patent, broadly attached, basally multistratose scales occurring on the rhizome, frond axes, and adaxially on the veins, the larger scale margins regularly set with short multicellular, uniseriate hairs and capitate glands, glands may also occur on the scale lamina, also with clavate, unicellular glands and simple uniseriate trichomes abaxially along the veins. Sori circular, inframedial on unmodified vein branches, or terminal on abbreviated vein branches; sporangium long-stalked, 3-seriate below the capsule, simple, or with a long isocytic hair; capsule globose, with (13-)15(-17) indurated annulus cells and a well defined stomium, epistomium 4(-5)-celled, hypostomium 4(-5)-celled; indusium reniform, entire, adaxially with numerous unicellular, clavate glands. Spores 64 per sporangium, ellipsoidal, monolete, with prominent folds, tuberculate, 27-40 µm long. Chromosome number based on 2n = 82.