44. NEPHRODIUM, LASTREA. 263 



A. Brackenridgii, Mett., from Polynesia, is said to differ by its reduced lower lobes, and 

 the presence of a small black gland at the base of the midrib of the pinnse. 



20. N. (Last.) attenuatum, Baker ; st. 1 ft. or more 1., firm, glossy, naked ; 

 fr. 3-4 ft. 1., 2 ft. br. ; pinnae 9-12 in. 1., f- in. br., very acuminate at the point, 

 the edge cut three-quarters of the way down into entire, spreading, blunt lobes 

 1 lin. br., the basal lobes much reduced, lower pinnse slightly stalked ; texture 

 subcoriaceous ; rachis naked ; under surface glandular ; veinlets 12-16 on a 

 side ; sori in a close row near the midrib. Lastrea, J. Sm. (not Brack.) 



Hab. Philippines, Cuming, 327. Habit of Didymochlcena polycarpa. 



21. N. (Last.) abruptum, Baker; st. 1^ ft. L, angular, slightly villose above ; 

 fr. 2-3 ft. 1., 1 ft. or more br. ; pinnae 6-8 in. 1., 1 in. br., cut down to a broad lv- 



winged rachis into close, acute, falcate, entire lobes i in. br., the basal lobes 

 rather reduced, and the pinnae on the upper side cut off in a slight curve ; texture 

 subcoriaceous, rigid ; rachis and both surfaces nearly naked ; veinlets prominent, 

 12-16 on a side, with the sori near the apex. Aspid. Kze. Mett. (iion Blume). 



Hab. Peru. General habit and texture of N. invisum. 



22. N. (Last.) invisum, Baker ; rhizome stout, wide-creeping, scaly ; st. 1-2 ft. 

 1., smooth ; fr. 3-4 ft. L, 1-2 ft. br. ; pinnae 6-12 in. L, ^-f in. br., cut down 

 nearly to the rachis into entire, linear-subfalcate lobes 1 lin. br., the basal ones 

 the largest ; texture subcoriaceous, rigid ; rachis and under surface naked or 

 finely villose ; veinlets 10-15 on a side, with the sori midway between the edge 

 and midrib. Polyp. Swz. N. macrourum and Serra, Hk. Sp. 4. p. 96-8. 



Hab. Mexico and Cuba, southward to Brazil and Peru. A larger and more rigid 

 plant than iV. patens, with narrower and more acute lobes, and closer and more pro- 

 minent veiulets. 



23. N. (Last.) immersum, Hk. ; st. tufted, 2 ft. 1., or more, naked, sub- 

 stramineous ; fr. 3-4 ft. L, ]-2 ft. br. ; pinnae often 1 ft. 1., 1-1 in. br., cut 

 down very nearly to the rachis into spreading linear lobes 1 lin. br., with more 

 than their own space between them ; texture papyraceo-herbaceous ; rachis and 

 under surface naked or slightly pubescent and glandular; veinlets 10-20 on a 

 side ; sori submarsjinal, immersed so as to project on the upper surface ; invol. 

 subpeltate. Hk. Sp. 4. p. 112. 



Hab. Assam, Philippines, Malaccas. Perhaps the shape of the involucre would jus- 

 tify our placing this in Aspidium, but in other respects it comes near the following four 

 species. L. caudiculata, Presl, is said to differ from this by its medial sori. 



24. N. (Last.) SpeJcei, Baker ; st. 1 ft. 1., stramineous, slender, fibrillose ; fr. 

 18-24 in. 1., 9-12 in. br. ; pinnae 4-6 in. 1., 1 in. br., cut down very nearly to 

 the rachis, entire, those of the fertile frond 1 lin. br., those of the barren frond 

 wider ; texture papyraceo-herbaceous ; main rachis and that of the pinnse slightly 

 fibrillose ; under side naked ; veinlets 8^-12 on a side ; sori midway between the 

 edge and midrib ; invol. subpeltate. 



Hab. Johanna Island, Capt. Speke, Dr. Kirk ; Angola, Welwitzsch. This comes near 

 the last, but the texture is Dinner, the veinlets are fewer, and the sori medial, and not 

 immersed. A plant from the Cameroon Mountains differs only by its more scaly 

 rachises. 



25. N. (Last.) crinibulbon, Hk. ; st. 9-12 in. 1., tufted, slender, glanduloso- 

 pilose, and fibrillose, especially below ; st. 1 ft. L, 6 in. br. ; pinnce spreading, 

 3 in. 1., f -f in. br., cut down very nearly to the rachis into linear-oblong entire 

 lobes | in. br. ; texture herbaceous ; rachis fibrillose and viscose, and midrib 

 beneath slightly so ; veinlets 5-6 on each side, with the sori nearly terminal. 

 Ilk. Sp. 4. p. 92. t. 244. 



