414 



A8PLENIUM 



ASPLENIUM 



2. Nidus, Linn. (Thamndpteris NMus, Presl. A. and 

 T. Nidus-Avis, Hort.). BIRD'S-NEST FERN. Fig. 414. 

 Much like the preceding in size and habit of growth, but 

 with entire margined Ivs. and with the veins partly 

 united to form a net. 



BB. Lf. lobed or pinnatifid. 



3. Hemionitis, Linn. (A. palmatum, Lam.). Lf. 4-6 

 in. each way, hastate, with a triangular terminal lobe 

 and 2 lateral ones, and a large, rounded sinus at the 

 base: sori often over 1 in. in length. Spain, Canary 

 Ids. S. 1:586. 



4. pinnatifidum, Nutt. Lvs. clustered, from a short 

 rootstock, 3-9 in. long, with mostly rounded lobes at the 

 base and terminating in a slender point; texture thick, 

 herbaceous; occasionally rooting at the tip. Pa. to Ala. 

 S. 1 :628. 



5. ebenoides, R. R. Scott. Texture thin: Ivs. 5-10 in. 

 long, with a few irregular divisions near the base, and 

 a long, slender, much-incised apical portion, occasionally 

 rooting at the apex. A very rare native fern. One of 

 the very few definitely proved fern hybrids, its hybrid 

 name being A. platyneuron x Camptosorus rhizophyllus. 



414. Asplenium Nidus. 



6. alatum, HBK. Lvs. lJ^-2 ft. long, the stalks 4-6 

 in. long, winged above, the blades 1-1 % ft. long, 3-4 

 in. broad, deeply pinnatifid, the rachis winged 

 throughout, the lobes 1-1 J< in. long, J^-Mm. broad, 

 herbaceous. W. Indies and S. Amer. 



BBB. Lf. once pinnate. 



c. Pinnx less than %in. long, blunt. 



D. Rachises greenish. 



7. viride, Hudson. Lvs. 3-8 in. long, scarcely more 

 than J^ia. wide, with numerous rather distant Ifts., which 

 are ovate and deeply crenate: sori abundant, oblique. 

 A subalpine species of N. Eu. and N. Amer. S. 1 :661. 



DD. Rachises purplish or blackish. 



8. Trichfimanes, Linn. Lvs. densely clustered, 3-8 in. 

 long, J^in. wide, with densely crowded oval Ifts. which 

 are slightly crenate on the upper side and suddenly nar- 

 rowed at the base. Northern hemisphere generally A G 

 13:653. 8.1:653. Gn. 59:318 (as A. incisum). 



9. resQiens, Kunze (A. pdrvulum, Mart. & Galeotti). 

 Lf . 5-9 in. long, with 20-30 pairs of mostly opposite Ifts., 



which are %-% in. long, rounded at the outer margin 

 and squarely truncate at the base. Southern states and 

 Mex. 



CC. Pinnx %-l in. long, with a strong auricle at the upper 

 side of the base or deeply incised on the upper margin. 



10. platynettron, Oakes (A.ebenkum, Ait.). Lvs. 6-15 

 in. long, with 30-35 pairs of Ifts. which have an en- 

 larged auricle at the upper side at the base, the lower 

 Ifts. reduced to mere triangular auricles: sori, when 

 mature, covering the entire surface. Canada to S 

 Amer. A.G. 13:654. 8.1:535. 



11. form&sum, Willd. Lvs. 12-16 in. long, with 

 numerous alternate pinna; which are mostly deflexed, 

 with the upper margin deeply incised and the lower 

 margin toothed: sori 3-5 to each 1ft. Trop. Amer. S. 

 1 : 576. 



12. tenerum, Forst. (A. Veitchianum, Hort.). Lvs. 

 1-1 H ft. long, the stalks 4-6 in. long, grayish, the 

 blades 8-15 in. long, 3-4 in. broad, 1-pinnate with 10-20 

 pairs of stalked pinnae, the pinnae \-\ l /i in. long, J^- 

 Hiin. broad, rounded, toothed, inequilateral, usually 

 auricled. Asia, Malaya. 



13. Colensoi, Col. Stalks 3-^ in. long, with small 

 scales: If.-blades 4-5 in. long, 2 in. broad; pinnae 

 numerous, spreading, the lower pinnatifid auricled, on 

 stalks M-Min. long. New Zeal. 



ccc. Pinnse %- in. long, linear or lanceolate. 



14. angustifdlium, Michx. Lvs. 18-24 in. long on 

 stout stalks, 4-6 in. wide, with 20-30 pairs of nearly 

 sessile pinnae, which are truncate at the base and extend 

 to a tapering point; fertile pinnae narrower and more 

 distant. Moist woods northward. 8.1:496. 



15. salicifdlium, Linn. Lvs. 12-18 in. long, with about 

 20 distinctly stalked horizontal pinnae, which are wedge- 

 shaped at the base, and curve upward to a long point: 

 sori strongly oblique to the midrib, wide apart, not 

 reaching either margin or midrib. W. Indies to Brazil. 



16. caudatum, Forst. Stalks 4-6 in. long, densely 

 clothed with fine fibrillose scales: blades 12-18 in. long, 

 4-8 in. broad, with 20-30 pairs of pinnae, the pinnae 

 34 in. long, yfa-\ in. broad, acuminate, deeply toothed, 

 auriculate above. Polynesia, Malaya. 



17. lucidum, Forst. Stalks 3-6 in. long, grayish, 

 densely clothed with large gray scales, the blades 1-2 ft. 

 long, 4-8 in. broad, oblong, or ovate-deltoid, with a 

 terminal pinna and 1520 pairs of lateral pinnae; pinnae 

 4-6 in. long, 1-1 ^ in. broad, acuminate, toothed. New 

 Zeal. 



BBBB. Lf. 2-4 pinnate. 



c. Ultimate divisions linear or cuneate: venation somewhat 

 fan-shaped: texture thick. 



18. Baptistii, Moore. Lf. bipinnate, with broadly 

 ovate pinnae 5 in. or more long, each with about 4 stipi- 

 tate linear toothed pinnules; sori nearly parallel with 

 the midvein and close to it; rachises scaly, with pur- 

 plish lined scales. South Sea Isls. 



19. affine, Swartz. Lf. 9-18 in. long, with numerous 

 pinnae on either side, the lower ovate deltoid, the upper 

 lanceolate; pinnules incised: sori linear. Mauritius 

 and Ceylon to E. Indies. 



20. Adiantum-nigrum, Linn. Stalks brownish, Ivs. 3- 

 pinnatifid from winged rachises, triangular, 5-9 in. long; 

 ultimate divisions ovate, sharply incised and serrate on 

 both sides. Old World generally. S. 1:486. 



21. cuneatum, Lam. Lvs. 12-16 in. long, 4-6 in. wide, 

 tripinnate below, the ultimate divisions broadly obtuse 

 above and strongly cuneate below: sori linear, usually 

 long for the size of the segms. Tropical regions 

 generally. 



22. fragrans, Swartz (A. fomiculaceum, Kunth). 

 Lvs. 2-3-pinnate; ultimate segms. lanceolate, sharp- 

 serrate above; veins simple or the lowest forked: sori 



