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Volume I (1961) - Flora of New Zealand Indigenous Tracheophyta - Psilopsida, Lycopsida, Filicopsida, Gymnospermae, Dicotyledons
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Hymenophyllaceae Mart.

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

Key

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

See Copeland, Genera Filicum, 1947, pp. 31-44, and in Philipp. J. Sci. 67, 1938, 1-110.

Fig. 2. HYMENOPHYLLACEAE. Indusia. (× 20). © All rights reserved. [Image: 4X12]
Fig. 2. HYMENOPHYLLACEAE. Indusia. (× 20). © All rights reserved. [Image: 4X12]
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