490 
FIUCES. 
Mauritius, Rodriguez, and Seychelles, the typical form rare, the variety 
common in forests. Cosmopolitan in the tropics. Lady Barkly has shown conclu- 
sively, by tracing out the intermediate stages, that A. pygmaeum , Bojer, Hort. Maur. 
395, is merely an undeveloped form of this species. 
17. A. borbonicum, Uoolc. ; Hook, and Baker , Syn , Fit. 222. Root- 
stock erect ; scales small, brown, lanceolate. Stipes contiguous, green, 
naked, 4-6 in. long. Frond lanceolate, subcoriaceous, glabrous, tripin- 
natifid, ^-1 foot long, 3-4 in. broad ; rachis naked. Pinnae lanceolate, 
in. broad, parallel with the rachis on the upper side at the base, 
cuneate on the lower, many upper segments simple, parallel, ligulate, 
obtuse, the lowest on the upper side usually deltoid and deeply flabel- 
lately lobed. Veins solitary in the centre of the segments, which are 
so narrow that the medial solitary sorus seems marginal. Caeuopteris 
furcata, Bojer , Hort. Maur. 393. A. rutaefolium, var., Kuhn, Ml. 
Afric. 115. 
Mauritius, in the mountain forests of Grandport. Also Bourbon. 
18. A. viviparum, Brest ; Hook, and Baker, Syn. Fit. 223. Root- 
stock erect ; scales large, linear, brownish-black. Stipes contiguous, 
green, naked, 4-6 in. long. Frond oblong-lanceolate, moderately firm 
in texture, bright green, glabrous, i-l-i foot long, 6-8 in. broad, 3^- 
pinnate, usually copiously viviparous. Pinnae close, lanceolate, 1-1^ 
in. broad, parallel with the rachis on the upper side at the base, cuneate 
on the lower; ultimate segments linear, acute, erecto-patent, -^-^in. 
broad. Veins single in the centre of the segments, which are so nar- 
now that the short sorus seems quite marginal. Caenopteris vivipara, 
Bojer, Hort. Maur. 394. 
Mauritius, common in the forests. Also Bourbon and Madagascar. 
19. A. sylvaticum, Brest ; Hook, and Baker , Syn. Fit. 232. Root- 
stock erect ; scales dark-brown, lanceolate. Stipes tufted, f-1 ft. long, 
scaly towards the base. Frond oblong-lanceolate, membranous, 1-1^ 
ft. long, 6-8 in. broad, glabrous, simply pinnate ; rachis naked. Pinnae 
lanceolate, sessile or the lower ones stalked, 3-4 in. long, f-1 in. 
broad, acute, shallowly lobed down the edges, parallel with the rachis 
on both sides at the base. Veins in a pinnate group opposite each 
lobe, with several ascending distinct free veinlets. Sori reaching along 
nearly the whole length of the veinlets, only the lowest double. In- 
volucre narrow, glabrous, membranous. Diplazium sylvaticum and 
humile, Bojer, Hort. Maur. 398. 
Mauritius, in forests. Cosmopolitan in the Tropics. 
20. A. arbor escens, Mett.j Hook, and Baker, Syn. Fit. 240. 
Ptootstock arborescent ; scales not seen. Frond ample, deltoid, tripin- 
natifid, glabrous, moderately firm in texture ; rachis straw-coloured, 
naked, unarmed. Lower pinnae oblong-lanceolate, 1-1J foot long, 
