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Parent: FILICALES

5. HYMENOPHYLLACEAE

Receptacle formed by extension of veinlet; indusium bivalved to urceolate or tubular, terminal on segs; annulus complete, oblique to nearly transverse; spores tetrahedral. Terrestrial, rupestral, or epiphytic, mostly with well-developed rhizome; fronds delicate, "filmy", with the lamina predominately one-cell thick. Family of subcosmopolitan distribution, variously divided into a few or many genera.

KEY TO GENERA AND SUBGENERA

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1
Indusium cup-shaped, distinctly bivalved; receptacle not or hardly exserted: 1. HYMENOPHYLLUM 2
Indusium tubular to urceolate, mouth entire to minutely 2-lipped; receptacle far-exserted: 2. TRICHOMANES 8
2
Fronds densely clad in stellate hairs mixed with close-set clavate papillae; final segs linear, subterete APTEROPTERIS
Fronds not as above 3
3
Fronds not over 25 mm. long, simple to digitately divided; margins black; indusia valvate to base CRASPEDOPHYLLUM
Fronds not as above 4
4
Margins of lamina entire 5
Margins of lamina toothed 6
5
Lamina glab. (occ. with simple hairs) MECODIUM
Lamina more or less beset with stellate hairs SPHAEROCIONIUM
6
Lamina, at least marginally, bearing hairs SPHAEROCIONIUM
Lamina glab 7
7
Receptacle protruding from indusium MERINGIUM
Receptacle not protruding from indusium HYMENOPHYLLUM
8
Fronds tufted on stock or abbreviated rhizome 9
Fronds distributed along spreading rhizome 10
9
Fronds erect; tips of segs rounded MACROGLENA
Fronds pendulous; tips of segs toothed SELENODESMIUM
10
Lamina reniform, stiff; veins radiating from sinus, repeatedly forked CARDIOMANES
Lamina and veins not as above 11
11
Veins with numerous veinlets; fronds pale green POLYPHLEBIUM
Veins simple or forked; fronds dark green 12
12
Indusium distinctly stalked VANDENBOSCHIA
Indusium immersed or partly so CREPIDOPTERIS
Fig. 2. HYMENOPHYLLACEAE. Indusia. (× 20).