=A. Rebeccæ= (Rebecca's).* _cau._ slender, 8ft. high. _fronds_ ample, bipinnate; pinnules twenty to thirty on each side, the lower ones stalked, linear, 2in. to 3in. long, more or less inciso-crenate, apex acuminate. _sori_ principally in two rows between the midrib and edge. Queensland. Greenhouse species. See Fig. 65, for which we are indebted to Mr. Bull.
=A. sagittifolia= (arrow-leaved).* _fronds_ oblong-deltoid, 4ft. to 6ft. long, bipinnate. _rachises_ stramineous, muricated; pinnæ lanceolate, 3/4ft. to 1ft. long, the lower shorter, deflexed; pinnules sessile, ligulate, crenulate, cordate on both sides at the base, 1in. to 1-1/2in. long, nearly 1/4in. broad. _sori_ large. Trinidad, 1872. Very handsome and distinct stove species.
[Illustration: FIG. 64. ALSOPHILA ACULEATA.]
=A. Scottiana= (Scott's).* _fronds_ ample, tripinnatifid. _rachises_ castaneous, naked and smooth beneath; pinnæ oblong-lanceolate, 1-1/2ft. to 2ft. long; pinnules sessile, 3in. to 4in. long, about 1/2in. broad, ligulate, cut down to a narrow wing on the rachis; segments ligulate, blunt, dentate, sub-falcate, not 1/8in. broad. _sori_ sub-costular. Sikkim, 1872. Greenhouse species. SYN. _A. comosa_.
=A. Tænitis= (Tænitis-like).* _fronds_ 3ft. to 6ft. long, bipinnate; pinnules distant, 3in. to 5in. long, lanceolate, acuminate, glabrous, sub-entire, petioled; petiole articulated on the rachis. _sori_ in a single series, equidistant between the costa and the margin, mixed with long, copious hairs. Brazil. An elegant stove species.
=A. villosa= (villous).* _cau._ 6ft. to 12ft. high. _sti._ 1ft. or more long, tubercular, densely clothed at the base with ferruginous scales. _fronds_ from 6ft. to 8ft. long, bi- or sub-tripinnate, broadly lanceolate in outline; pinnules 1in. to 3in. long, oblong-lanceolate, obtusely acuminate, deeply pinnatifid; lobes oblong, obtuse, entire or coarsely serrated. _sori_ copious. Tropical America. A very beautiful stove species.
=ALSTONIA= (in honour of Dr. Alston, once Professor of Botany at Edinburgh). ORD. _Apocynaceæ_. Usually tall, lactescent, or milk-bearing stove evergreen shrubs or trees, with small white flowers, which are disposed in terminal cymes. Leaves entire, opposite or often whorled. Of easy culture, thriving best in a mixture of peat, loam, and sand. Cuttings root readily in sand, in heat. Besides the one mentioned, there are eleven other species.