A TAXONOMIC REVISION OF HYMENOPHYLLACEAE

A. Ebihara et al.: A taxonomic revision of Hymenophyllaceae
ferum (L.) Ebihara & Dubuisson, comb. nov. [based on Trichomanes pyxidiferum L. (1753) 1098];
P. vieillardii (Bosch) Ebihara & K. Iwats., comb. nov. [based on Trichomanes vieillardii Bosch (1861c)
90]; P. werneri (Rosenst.) Ebihara & K. Iwats., comb. nov. [based on Trichomanes werneri Rosenst.
(1908a) 35].
Other species:
Polyphlebium venosum (R.Br.) Copel.
5. VANDENBOSCHIA
Vandenboschia Copel. (1938b) 51. — Trichomanes L. subg. Vandenboschia (Copel.) Allan (1961)
34. — Type: Vandenboschia radicans (Sw.) Copel.
Distribution — Throughout the tropics, extending to northern temperate regions;
more than 15 species.
Habitat — Hemi-epiphytic on tree trunks or epilithic, occasionally terrestrial.
Chromosome base number — x = 36.
Note — Corresponding to the Va clade in Ebihara et al. (submitted). Our molecular
analysis shows Copeland’s genus Vandenboschia evidently of polyphyletic origin – he
included species of at least four different lineages (the Va, Po, PT, NT clades in Ebihara
et al., submitted). Vandenboschia, in the present system, refers to V. radicans, type of
Vandenboschia, and its relatives. Nakaike (1975) advocated the application of the generic
name Lacosteopsis instead of Vandenboschia on the grounds that Vandenboschia
was an invalid generic name since Copeland (1938b) included the type of an existing
genus (T. scandens) when he established Vandenboschia (T. Nakaike, pers. comm.). This
confusion was attributed to the controversial typification of Trichomanes as noted above.
Recent nomenclatural conservation of T. crispum against T. scandens (Greuter et al.,
2000) denied the claim that Vandenboschia is an illegitimate name (Morton, 1968;
Holttum, 1976).
KEY TO THE SUBGENERA
1a. Blades bipinnate or more finely divided, hemi-epiphytic or epilithic . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1. Subg. Vandenboschia
b. Blades simply pinnate, hemi-epiphytic . . . . . . . . . . . . . . . 2. Subg. Lacosteopsis
1. Subgenus Vandenboschia
Rhizomes short- or long-creeping, irregularly branching, rather thick, to 1.7 mm diam.,
densely covered with brown to bright brown multicellular hairs, protostele reduced,
cortex heterogeneous, roots numerous and robust. Stipes 1–16 cm long, clustered or
irregularly distanced. Blades bipinnate to 5-pinnatifid, ovate to linear-ovate, 40 by
20 cm, venation anadromous, false veinlets absent, laminae often reduced, regular
arrangement of elongate cells observed in some species, internal cell walls various
(thin to thick, straight to coarsely pitted). Sori paratactic, tubular to campanulate, lips
sometimes dilate, receptacles long-exserted.
Distribution — Throughout the tropics, extending to northern temperate regions;
more than 15 species.
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