ASP LENIUMj § HEMIDICTYUM.
271
base). New Ireland , Hindes. Tobie Island, Barclay. W. Tropical Africa, Curror.Fernando Po , Vogel , Niger Exped. n. 130 (stipes and rachis muricated), Barter .—This is a noble species, and seems widely distributed, and, as is then generallythe case, trilling varieties are unnecessarily multiplied into species. The muri-cated character of the stipes and rachis is common even to the Mauritius form.The Digrammaria robusta is merely a luxuriant state, having some of the pinnaeagain pinnate below, the rest deeply pinnatifid, and is seen on specimens fromBourbon (whence I have pinnae of the kind 18 inches long), the Mauritius , andin the Pacific Islands , found by Brackenridge and Milne.*
E. Hemidictyum.— Sort very long, naked, asplenioid {single). Veins anastomosingtowards the margin. —Hemidictyum, Pr. (Hook. Gen. Fil. t. 55. A.) Asple-nidictyon, J. 8m. Ceterach (Hook. Gen. Fil. t. 63 A). y
(Veinlets at their apices combined with a continuous, transverse, marginal vein.— Gen. Hemidictyum, Pr.)
302. A. (Hemidictyum) marginatum , L.; glabrous, caudexerect short thick rooting subarboreous, stipites stout 2-3 feetlong subulate paleaceous below, fronds ample 4-6 feet longmembranaceous pinnated, pinnae 12-18 inches long 3-4 incheswide broad-oblong shortly acuminate sessile auriculato-cordateand crenato-sinuate at the base, costa stout, veins horizontallypatent forked free below towards the margin copiously ana-stomosing and forming subhexangular network near the mar-gin, the veinlets uniting with a transverse continuous veinjust within the margin, sori copious linear very long parallelfree.— Linn. Sp. PI. p. 309. Sw. Syn. Fil. p. 76. Willd. Sp.PI. p. 309. Hook. Fil. Exot. t. 63. Metten . Asplen. p. 170.A. limbatum, Willd., and A. Mikani, Pr. Hemidictyum mar-ginatum, Pr. Tent. Pterid. p. 111. t. 3. f. 24. Hook. Gen.Fil. t. 55 A. H. Peruvianum, Pr. Epimel. Bot. p. 74. Plum.Fil. t. 88. /. 106.
Hab. One of the finest and most common of tropical American Ferns, espe-cially in the West Indian Islands, on the borders of streams, and in damp, moist,and shady woods. On the continent of S. America it is perhaps less abundant.We possess it from Brazil , Raddi, Gardner, n. 31. Venezuela , Funck , n. 77 ;Fendler , n. 167. Tarapota, Eastern Peru, Spruce , n . 4783.
(Terminal veinlets at the apices free, or rarely connected at the margin .—Gen. Asplenidictyon, J. Sm.)
303. A. (Hemidictyon) Finlaysonianum, Wall.; caudex
* Dubious species of this Anisogonium- (or Callipteris-)% roup, at least referredto it by Mettenius, are as follows:— Diplazium spinosum, Bory. Sandwich Islands .
- Asplenium Luzoniense, Spr. Luzon.- Diplaz. fraxinifolium, Pr. (not
Wall.). Luzon.- Diplaz. serratum, Schuhm. W. Africa. Probably Aspl. de-
cussatum — Diplaz. undulosum, Sw.; Sw. Syn. Fil. p. 92, 284. Martinique .
- Diplaz. heteropteron, Kze. Ceylon, Gardner, n. 35.- Asplen. Manilense,