82 17. TRICIIOMAXES, EUTRICIIOMANES. 



Hab. Europe Ireland, Wales, Spain ; Africa Canaries, Madeira, island of St. Thomas, 

 Fernando Po, Angola, Johanna Island ; Asia Japan and Northern Hindostan, Polyne- 

 sian Islands ; America, from Alabama, Mexico, and the West Indian Islands southward 

 to Rio Janeiro. A very widely-diffused and variable plant. The two striking varieties 

 mentioned are both confined to the tropical zone. Van den Bosch refers T. scandens, 

 Linn., to our )8, but the plant of the Linnsean Herbarium is our species 61). 



51. T.auricuZatum, Blume; rhizome strong, wide-creeping, tomentose ;/r. nearly 

 sessile, 6-12 in. 1., 1^-2 in. br., bipinnatifid, rachi.s wiry, very slightly winged 

 throughout or above only ; pinnce shortly stalked, ovate-rhomboidal, obliquely 

 cuneate at the base, irregularly pinnatifid halfway down or more, the lowest 

 anterior lobe often considerably prolonged beyond the others ; texture sub- 

 coriaceous ; venation close, flabellate ; sori 2-12 to a pinna, the tube nearly or 

 quite exserted, the mouth truncate. Hk. Syn. 1. p. 133. T. dissectum, J. Sm. 

 HTc. Syn. 1. p. 140. Cephalomanes, V. D. B. 



Hab. Japan, Formosa, N. Hindostan, Philippines, Java, and Guiana. Placed by 

 Van den Bosch in the same genus as T. Javanicum, on account of the agreement in 

 venation. 



52. T. denticulatum, Baker ; rhizome slender, wide-creeping ; St. slender, naked, 

 -| in. 1. ; fr. l-l in. 1., in. br., ovate or oblong, bipinnatifid, main rachis 

 winged above, free below ; pinnce pinnatifid down to a narrowly-winged rachis ; 

 ultimate segtn. linear, serrated, about in. 1., \ lin. br. ; texture membranaceous ; 

 a costa only in each segment ; sori 1 to a pinna, terminal on the lowest segment 

 on the upper side, tube exserted, mouth with two bluntly triangular lips. 



Hab. Borneo, discovered by the late Mr. Motley. An interesting plant, combining 

 the habit of H. Tunbridgense with the fruit of a Didymoylossum. 



5,3. T. venosum, R. Br. ;' rhizome slender, wide-creeping; st. 1-2 in. ]., very 

 slender, naked ; fr. 2-5 in.l., \-\\ in. br., and pinnatifid, the main rachis free 

 in the lower half, broadly winged above ; lower pinnce about 1 in. 1., varying 

 from linear and nearly simple to lanceolate deeply pinnatifid below ; texture 

 membranaceous ; costa wavy, with numerous alternate once or twice dichotomous 

 secondary veins ; surface naked, shining ; sori only 1 to a pinna, axillary on the 

 upper margin, tube immersed, much dilated, slightly two-lipped. Hk. Sp. 1. 

 p. 132. Hk. 4 Gr. Ic. Fil. t. 78. Phlebiophyllum, V. D. B. 



Hab. Australia and New Zealand. A very distinct species. 



54. T. crispum, L. ; rhizome short or somewhat elongated, strong, tomentose ; 

 fr. scattered or tufted ; st. 2-6 in. L, strong, wiry, tomentose ; fr. 4-12 in. 1., 

 1^-2 in. br., lanceolate, fully pinnate or pinnatifid nearly to the rachis ; lower 

 pinnce f-1 in. 1., 2 lin. br., oblong, obtuse, spreading or even deflexed ; texture 

 membranaceous and the pinnse often incurved and crisped ; rachis more or less 

 clothed with reddish-brown hairs, the surface hairy, especially beneath, and the 

 margin ciliated ; lateral veins of the pinnoe usually once dichotomous ; sori 1 to 8, 

 placed round the apex of the pinnae, tube quite sunk, mouth two-lipped ; reccpt. 

 long, exserted. Hk. Syn. l.p. 130. Hk. & Gr. Ic. Fil. t. 12. 



Hab. Tropical America, from Cuba and Mexico southward to Peru and Brazil, and 

 recently gathered in West Tropical Africa (banks of the Nun and Niger) by Barter and 

 Mann. Apparently we include here all the simply pinnatifid section of Achomanes of 

 Van den Bosch, who enumerates eighteen species. The principal variation is in the 

 vestiture of the frond and elongation of the rootstock, so that the fronds are either tufted 

 or scattered. The extremes of the series in the former respect are T. pellucens, Kunze, 

 which is nearly naked, and T. Martiutii, Presl, and T. Plumula, Presl, in which the 

 rachis is densely clothed with long rust-coloured hairs, and the fronds also thickly coated, 

 especially beneath. 



55. T. crinitum, Swartz ; st. tufted, 1-3 in. 1., slender, villose ; fr. 2-8 in. 1., 



