The Philippine journal of science. [Vol. 67, no. 1]

67, 1

Copeland: Genera Hymenophyllacearum

85

MACROGLENA STRICTA (Menzies) Copeland comb. nov.
Trichomanes strictum MENZIES, Hooker and Greville, Ic. Fil. (1831)
pi. 122; COPELAND, Trich. (1933) 259, pl. 56, figs. 3, 4.
NEW ZEALAND.
33. Genus ABRODICTYUM Presl
Abrodictyum PRESL, Hymen. (1843) 112, pl. 7.
Epiphyticum ad truncos filicum, rhizomate breve, parvo, stipitibus dense caespitosis, basi setosis, teretibus; fronde mediocre
bipinnatifida vel subtripinnatifida anguste elliptica, pendente, segmentis linearibus; cellulis (marginalibus exceptis) transversim
elongatis, et oblique longitudinaliter instructis, parietibus conspicue vittatis; involucro infundibuliforme limbo patente receptaculo setaceo valde elongato.
A single species, without particular evident affinity, common
on tree-fern trunks in the Philippines, and reported from Celebes (Kjellberg and Christensen) and the Moluccas (van den
Bosch).
Van den Bosch altered the name to Habrodictyon.
SPECIES OF ABRODICTYUM
ABRODICTYUM CUMINGII Presl.
A large majority of the species of the Hymenophyllacea. are
found in the moist Tropics. In this sense only, the statement
of Sadebeck, is correct: "Das Centrum der geographischen Verbreitung ist in den Tropen." B5 The origin of the family, as it
now exists, was Austral. Sadebeck notes that New Zealand is
"fast ein zweites Centrum"; and both he and Christ, as others before them, note the wealth of these plants in Antarctic America.
But these conditions seem to have been interpreted as evidence
that ferns of tropic origin find there a sufficiently uniform
humidity and temperature. Like the Gleicheniaceae and Blechnum, as to both of which Diels notes how far south they "vordringen," the Hymenophyllaceae present most perfect geographic
evidence of Antarctic origin, and of migration into, not from,
the Tropics.
The Hymenophyllaceae constitute about one fourteenth of the
world's fern species, and this proportion may rise to about
one in twelve in the Tropics. This is the closest whole number
for Borneo and Java. Eastward migration from the Malay

Nat. Pflanzenfamilien. Teil I Abt. 4 (1902) 104.