238 44. NEPHRODIUM, LASTREA. 



those of the barren frond the broadest ; lower pimice small, deflexed ; vein-lets 

 rarely forked, G- 10 on a side ; texture herbaceous ; rachis and both sides naked ; 

 sori soon confluent, in rows near the flat edge. Hk. Sp. 4. p. 89. 



Hab. Canada and United States. Habit of N. Tkdypteris, from which it may be 

 known by its simple veins and reduced lower pinuae. 



49. N. (Last.) contcrminum, Desv. ; st. densely tufted, 6-9 in. ]., naked or 

 villose ; fr. 12-18 in. 1., 4-8 in. br., oblong-lanceolate ; central pinnae the longest, 

 2-4 in. ].", | in. br., cut down to the rachis into entire lobes about 1 lin. br., the 

 lowest lobes often enlarged, the lower pinnae decreasing gradually ; texture 

 herbaceous or subcoriaceous ; rachis naked or pubescent ; under surface often 

 slightly villose and glandular ; veinlets 6-8 on a side ; sori submarginal ; invol. 

 minute, fugacious. Hk. Sp. 4. p. 91. 



Hab. W. Indies and Mexico, southward to Brazil, Chili, and Bourbon. This, 'which 

 appears to be abundant throughout Central America, has the general habit of N. The- 

 lypteris and Noveboracense, with an erect caudex. We cannot distinguish clearly A. oliyo- 

 carpum, Kth., A. Funckii, Mett., and A. pilosulum, Klotzsch. Fe'e makes of this a 

 genus Oochlamys, characterized by an involucre receding from that of typical Nephrodium 

 towards Aspidium, and enumerates seven West-Indian species. 



50. N. (Last.) Kaulfusii, Hk. ; st. tufted, 4-6 in. 1., slender, slightly pubescent ; 

 fr. 1-^-2 ft. 1., 6-8 in. br., oblong-lanceolate; pinnae 8-4 in. 1., -|-f- in. br., cut 

 down nearly to the rachis into spreading, entire blunt lobes 2 lin. br., the 

 lower lobes not enlarged and lower pinnse dwindling down gradually ; texture 

 herbaceous or subcoriaceous ; rachis and under surface finely pubescent ; veinlets 

 about 6 on a side ; sori medial ; invol. fugacious. Hk. Sp. 4. p. 97. 



Hab. West Indies to Brazil. This differs from the last by its broader lobes and medial 

 sori. Both Mettenius and Grisebach unite it with oligocarpum. 



51. N. (Last.) concinnum, Baker; rhizome wide-creeping; st, 6-12 in. ]., 

 naked or slightly pubescent ; fr. 1-2 ft. 1., 6-8 in. br., oblong- lanceolate ; pinnae 

 3-4 in. 1., f-1 in. br., cut down nearly to the rachis into spreading or falcate 

 entire lobes in. br. ; texture subcoriaceous ; rachis and under surface slightly 

 villose; veinlets 6-8 on a side; sori submarginal ; invol. minute, ciliated, 

 fugacious.. Polyp. Willd. 



Hab. Mexico to Chili. This may be best known from the two preceding by its creeping 

 rhizome. A. rivulorum, Link, is said to differ by its medial sori, and the presence of a 

 gland at the base of the pinnae beneath ; and Pheg. adenochrysa, Fee, may be this without 

 an involucre. 



52. N. (Last.) Sprengelii, Hk. ; st. 6-12 in. 1., stramineous, nakedjor slightly 

 pubescent; fr. 2-4 ft. 1., often 1 ft. br. ; pinnce 6-8 in. 1., 1 in. br." cut down 

 nearly to the rachis into entire lobes 1-1^ lin. br., the lower ones with a gland at 

 the base beneath; texture herbaceous or subcoriaceous; under surface naked or 

 slightly villose and glandular ; veinlets 8-12 on a side; sori submarginal. 

 Hk, Sp. 4. p. 94. 



Hab. West Indies and Guatemala. A much larger plant than N. conterminum, with a 

 basal gl.ind, and nearly twice as many veiulets. 



53. N. (Last.) prolixum. Baker ; st. 1-2 ft. L, firm, glossy, substramineous, 

 naked or nearly so ; fr. 2-4 ft. 1., 8-12 in. br. ; pinnce 4-8 in. 1., |-1 in. br., cut 

 down nearly to the rachis into entire or bluntish, often falcate lobes 1-1^ lin. 

 br., with a prominent gland at the base beneath, the lower ones gradually 

 reduced ; texture subcoriaceous ; rachis and under side more or less villose ; 

 veinlets prominent, 10-15 on k side ; sori submarginal. Aspid. Willd. N. 

 ochthodes, Hk. Sv. 4. ?. 109. N. appendiculatum, Hk. 1. c. (3, N. tylodes (Kzc. 



