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Lomagramma J. Sm.

Medium size, high-climbing epiphytes. Rhizome vertically long-creeping, stout, little-branched, bearing roots ventrally and fronds in (2 - ) 3 - 5 dorsal rows, dictyostelic with a large +/- channelled ventral strand producing root traces, and 2 or more dorsal wedge-shaped strands, large overlapping leaf gaps with leaf traces of several to many strands arranged in a ring; scales on young parts broad, flat, thin, +/- clathrate, peltate. Stipes long, +/- terete, with 2 continuous aerophores, the stipe and aerophores both gradually decurrent into the ridges of the rhizome, the vascular bundles in a simple open ring, the 2 adaxial bundles larger; upper fronds (acrophylls) simple, pinnate, or bipinnate, all pinnae or pinnules articulate to the rachis, the pinnae or pinnules +/- equal, lanceolate, chartaceous, glabrescent, margins entire or serrate; the veins anastomosing to from seveal rows of oblique areoles or submarginal free vein, no main veins; fertile pinnae contracted, sometimes strongly so, linear to linear-oblong; juvenile or lowere fronds (bathyphylls) of distinctive form, often with a winged rachis. Sporangia acrostichoid, the whole pinna or only the margins fertile, exindusiate, paraphyses slender stalked with dilated irregular apices of thick-walled cells; annulus longitudinal, interrupted, of 14 - 20 thickened cells. Spores monolete, translucent, smooth to granular, lacking a perispore.

Species in Papuasia

1 Mature plants with slender rhizomes bearing 2 rows of fronds; sterile pinnae with the edges strongly toothed throughout... L. brassii
Mature plants with broad rhizomes bearing 3 or more rows of fronds; pinnae not toothed throughout... 2
2 Sterile acrophylls very firm, veins indistinct, not prominent on the upper surface... L. novoguineensis
Sterile acrophylls with veins distinct and +/- prominent on the upper surface... 3
3 fertile pinnae c. 45 x 8 mm with rouded apices; sterile pinnae c. 13 mm wide, toothed towards the apices... L. novoguineensis
Fertile pinnae narrower or much longer... 4
4 Sterile acrophyll pinnae to 8 mm wide, entire... L. angustipinna
Sterile acrophyll pinnae greater than 10 mm wide, the narrower ones often toothed towards the apices... 5
5 Bases of lower sterile acrophyll pinnae broadly rounded to subcordate on both sides... L. leucolepis
Bases of sterile acrophyll pinnae distinctly asymmetric, narrower on the basiscopic side, acroscopic side broadly cuneate... 6
6 Fertile pinnae 5-8 mm wide; sterile pinnae 2-4 cm wide... L. sinuata
Fertile pinnae not over 4 mm wide; sterile pinnae mostly not over 2 cm wide... L. melanolepis

Key based on sterile acrophylls:

1 Pinnae very firm and opaque, veins not or slightly prominent... L. novoguineensis
Pinnae thinner, usually translucent when dry, veins always distinctly prominent... 2
2 Largest pinnae not over 15 mm wide... 3
Largest pinnae wider... 4
3 Largest pinnae c. 100 x 8 mm, entire... L. angustipinna
Largest pinnae usually wider, strongly toothed... L. brassii
4 Lower pinnae with basiscopic base broadly rounded to subcordate... L. leucolepis
Lower pinnae with basiscopic base cuneate or narrowly rounded... 5
5 Basiscopic base narrowly cuneate... 6
Basiscopic base rounded... L. sinuata f. papuana
6 Pinnae 2 - 4 cm wide, to 20 cm long... L. sinuata
Pinnae rarely over 2 cm wide, shorter... L. melanolepis

Key based on sterile bathyphylls only:

a Apical lamina lobed and continuous with the rachis on fronds with 15 - 20 pairs of pinnae... L. novoguineensis
b Apical lamina replaced by pinna jointed to the rachis on fronds with few pairs of pinnae... L. brassii
L. melanolepis
c Bathyphyll characters unkown... L. angstipinna
L. leucolepis