A TAXONOMIC REVISION OF HYMENOPHYLLACEAE

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BLUMEA — Vol. 51, No. 2, 2006
Distribution — Southern temperate regions (Chile and New Zealand); 2 species.
Chromosome base number — x = 36.
Habitat — Epiphytic, epilithic or terrestrial.
Note — This subgenus comprises only two species having tufted rhizomes, an exceptional
feature in Hymenophyllum. Evidence suggests that these two species, which
are disjunctly distributed in southern Chile and New Zealand, form a monophyletic
group (Hennequin et al., in press).
RepResentative species:
Hymenophyllum fuciforme Sw.; H. pulcherrimum Colenso.
9. Subgenus Diploöphyllum (Bosch) Ebihara & K. Iwats., comb. nov.
Based on Diploöphyllum Bosch (1861a) 322, non Diplophyllum (Dumort.) Dumort. (1835) 15,
nom. cons., ICBN 2000. — Hymenophyllum Sm. sect. Diploöphyllum C. Chr. (1906) XV. — Hymenophyllum
Sm. subsect. Diploöphyllum (C. Chr.) C.V. Morton (1968) 174, as ‘Diplophyllum’.
— Lectotype and sole species (in the present treatment): Hymenophyllum dilatatum (G. Forst.)
Sw. (selected by Christensen (1906) XV).
Rhizomes long-creeping, wiry, sparsely covered with dark hairs. Stipes 2–15 cm long.
Blades tri- to quadripinnate, ovate or narrowly ovate, 55 by 15 cm, laminae more than
two cells thick, margins of segments entire. Sori at the tips of ultimate segments, lips
bivalvate, entire, receptacles included in involucres.
Distribution — New Zealand, monotypic.
Habitat — Epiphytic on tree trunks.
Chromosome base number — x = 36.
Note — This monotypic subgenus is characterized by multilayered laminar cells
throughout its blades and long-creeping rhizomes. Molecular data (Hennequin et al.,
in press) suggest this is closely related to the subgenera Fuciformia and Cardiomanes.
Van den Bosch’s (1861a) original spelling of this taxon was Diploöphyllum, neither
‘Diploophyllum’ as used by Copeland (1938b) nor ‘Diplophyllum’ by Morton (1968),
and its inclusion of a diacritical sign as a diaeresis is legitimate in the latest Code
(Greuter et al., 2000, Art. 60.6).
10. Subgenus Cardiomanes (C. Presl) Ebihara & K. Iwats., comb. nov.
Based on Cardiomanes C. Presl (1843) 12. — Trichomanes L. subg. Cardiomanes (C. Presl) H. Christ
(1897) 33. — Type and sole species: Trichomanes reniforme G. Forst. (1786) 84 (= Hymenophyllum
nephrophyllum Ebihara & K. Iwats., nom. nov. = Cardiomanes reniforme (G. Forst.) C. Presl,
non Hymenophyllum reniforme Hook.).
Rhizomes long-creeping, wiry, sparsely covered with dark hairs. Stipes 5–25 cm long.
Blades simple, kidney-shaped, 35 by 13 cm, laminae more than two cells thick, margins
of segments entire. Sori at the blade margins, tubular, lips entire, receptacles exserted
from involucres.
Distribution — New Zealand, monotypic.
Habitat — Epiphytic.
Chromosome base number — x = 36.
Note — One of the most distinct subgenera of Hymenophyllum (formerly included
in Trichomanes s.l. due to its cup-shaped involucres). A replacement name is necessary
when Cardiomanes reniforme is moved to Hymenophyllum.