142 26. CASSEBEERA. 



51. C. Welwitschii, Hk. MSS. ; st. densely tufted, 4-6 in. 1., wiry, naked, 

 dark cliesnut-brovvn, polished ; fr. G-12 in. 1., 2-3 in. br., lanceolate, bipinnatifid ; 

 pinnce with l|-2 in. between the lowest, in opposite pairs, the lowest deltoid, 

 1^ in. 1., 1 in. br., cut down to the rachis below into long linear-oblong sinuato- 

 diftni&ie pinnl. ; texture subcoriaceous ; lower surface densely coated with bright- 

 yellow meal, the costse and rachis polished like the stipe ; sori numerous, small, 

 subcontiuuous, marginal. 



Hab. Angola, frequent— 2,400-3,800 ft., Dr. Wchvitsch, 148 & 198.— This comes near 

 C. aurantiaca, but is much more lengthened out in the stipe and frond. 



52. C. argentea, Hk. ; st. densely tufted, 3-6 in. 1., wiry, polished, dark 

 chesnut-brown, clothed at the base with linear scales when young ; fr. 3-4 in. 1., 

 2 in. br., deltoid, bi- or tripinnatifid, upper part not cut down to the rachis ; 

 lower pinnce much the largest, cut down nearly to the rachis ; lowest pinnl. 

 sometimes ^ in. 1., sinuato-pinnatifid ; rachis and costa polished like the 

 stipe ; upper surface naked, green, lower thickly covered with white ceraceous 

 powder ; sori numerous, very small, brownish, united at the base, marginal. — 

 Hk. Sp. 2. p. 76. — jS, C. chrysophylla, Hk. Sp. 2. p. 113; pinnl. more nearly 

 equal, in numerous opposite pairs, the frond narrower and longer, densely coated 

 with yellow, not white, powder on the under side. 



Hab. a, Siberia, from the Altai to Kamschatka, Japan, China, Malayan Peninsula, and 

 Khasya ; /3, Khasya, ascending to 5,500 ft. — There is a wide range of forms, as may be 

 well seen in the large quarto figure in Fil. Exot. t. 95. in the shape of the frond and 

 thickness and colour of the ceraceous coating. 



53. C. farinosa, Kaulf. ; st. densely tufted, 3-6 in. 1., wiry, polished, dark 

 chesnut-brown, clothed with linear scales when young ; fr. 3-12 in. 1., 3-6 in. 

 br., lanceolate or deltoid, bi-tripinnatifid ; pinnce in numerous opposite pairs, 

 the lower ones often much the largest, with the lowest pinnules longer than the 

 others (1-2 in. 1.) and deeply sinuato-pinnatifid, most of the others with a broad 

 entire central space ; texture subcoriaceous ; rachis and costa naked and polished 

 like the stipe ; under surface densely coated with pure white powder ; sori small, 

 brown, placed in a continuous line along the edges. — Hk. Sp. 2. p. 77. Hk. 8f 

 Gr. Ic. 184. Bot. Mag. t. 47C5. 



Hab. Africa — Cameroon Mountains, Angola, Zambesi Land, Bourbon, Abyssinia. 

 Asia — Arabia, Himalayas (up- to 7,000. ), Bombay, Neilgherries, Ceylon, Malayan 

 Penin.sula, Java, Philippine Islands, Brazil, Mexico (up to 8,000 ft.), Guatemala, New 

 Granada. — Very variable in .size. The coriaceous coating is occasionally thin, and some- 

 times yellowish. Includes Aleu7-itopteris farmosa, dealbata, and mexicana of F^e. 



Gen. 26. Cassebeera, Kaulf. 



Sori terminal on the veins, subglobose or oblong, not reaching beyond the 

 branches of a single vein. Invol. inserted distinctly within the margin and 

 separate from it, of the same shape as the sorus and pressed down upon it. Tab. 

 III. f. 26. Three local Brazilian species. 



1. C. triphylla, Kaulf. ; st. slender, wiry, 2-3 in. 1., naked, blackish, polished ; 

 fr. digitate, | in. each way, formed of 3 to 6 nearly equal linear-oblong seg- 

 ments ; texture coriaceous ; hoth surfaces naked ; sori in close rows along the 

 margin of the segments. — Hk. Sp. 2. p. 118. 



Hab. S. Brazil and Monte Video. 



2. C. pinnata, Kaulf. ; st. 6-12 in. ]., stout, erect, polished, dark -brown, naked ; 

 fr. about 6 in. each way, simply pinnate with crenate linear-oblong pinnce 2-3 



