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Antrophyum Kaulf.

Small to moderate size tufted, +/- pendulous epiphytes. Rhizome short-creeping or compact, fleshy, surrounded by a dense mass of water-retaining hairy roots, solenostelic or dictyostelic, densely covered by basally attached, entire or tothed, attenuate, clathrate scales. Fronds stipitate or subsessile, the stipe not articulate to the rhizome, fleshy, +/- winged, with 2 vascular strands, the lamina simple, entire, widening gradually from the base, linear-lanceolate to oblanceolate or spathulate, +/- fleshy, costa lacking or only evident at the base of the frond, veins anastomosing to form longitudinally elongate areoles without free included veinlets, or free in reduced species; epidermis with scattered elongate, thick-walled cells (spicular idioblasts). Sori elongate along most of the veins, in free, broken, forked or anastomosing lines, superficial or mostly immersed, sporangia on 3-seriate, apically widened stalks; exinsusiate, numerous branched, clavate or filiform paraphyses present; annulus longitudinal, interrupted, of c.14 thickened cells. Spores trilete, rarely monolete, globose, smooth, hyaline.

Species in Papuasia

1a. Paraphyses with apex thickened, clavate, obpyriform or capitate...
2
Paraphyses with apex not or hardly thickened...
3
2a. Fully developed fronds 2 cm or more broad...
A. parvulum
Fully developed fronds 2 cm or more broad...
3
3a. Frond sessile or short-stalked, ie. The unwinged part of the stipe very short with regard to the length of the whole frond...
4
Frond rather long-stalked, ie. The unwinged part of the stipe not very short with regard to the length of the whole frond...
A. plantagineum
4a. Fronds thinly chartaceous; paraphyses globose at apex...
A. strictum
Fronds coriaceous; paraphyses clavate at apex...
A. semicostatum
5a. Fully developed fronds at best c.2 cm broad...
6
Fully developed fronds c. 2.5 - 10 cm broad...
7
6a. Sori few in 2-6 lines...
A. subfalcatum
Sori rather copious...
A. coriaceum
7a. Sori +/- straight, continuous or interrupted, not reticulate...
8
Sori mostly flexuose, short or long, reticulate...
9
8a. Fronds ligulate-lanceolate; costa wanting or only distinct at the base of the frond...
A. callifolium
Fronds spathulate-lanceolate; costa more distinct in the lower half of the frond...
A. alatum
9a. Costa wanting, or present but then not black...
A. reticulatum
Costa present, black...
A. cumingii