Pteridaceae; Parkeriaceae; Davalliaceae 



47 



mm. wide, glabrous, the rachis often much extended beyond 

 the upper pinnae and proUferous at the tip; pinnae 15-20 on 

 each side, membranous, obliquely flabellate, 7-13 mm. long, 

 4-6 mm. wide near base, obtuse, the upper ones gradually 

 reduced, spreading, subentire to lobulate on anterior margin, 

 entire on the posterior side, glaucescent beneath, very short- 

 petiolulate; veins evident, slender; sori on the lobules of the 

 pinnae; false indusia reniform, brown, about 1 mm. long, 1-2 



mm. wide, glabrous. Kyushu (Buzen Prov.) ; rare. 



Manchuria, China, Formosa to Indochina, India, and Philip- 

 pines. 



5. Adiantum diaphanum Bl. A. setulosum J. Smith 



SuKiYA-KujAKU. Rhizomes short, the scales broadly linear, 

 membranous, about 1 mm. long; fronds slender; stipes purple- 

 brown, slender, lustrous, 10-20 cm. long, 0.5-1 mm. across, 

 with scattered spreading scales toward base; blades simply pin- 

 nate, bipinnate, or with I or 2 pairs of elongate basal pinnae, 

 the terminal pinna lanceolate, 7-12 cm. long, 2-2.5 cm. wide, 

 acute, the rachis slender, glabrous; pinnules membranous, 7-18 

 pairs, close together or overlapping, oblong-squarrose, oblique, 

 obtuse to rounded, cuneate at base, obtusely and irregularly 

 toothed except the lower two-thirds on posterior side, with 

 scattered dark brown bristles on both sides and on posterior 

 margin, the petioles about 1 mm. long; sori in deep marginal 

 sinuses near tip; false indusia cordate, gray-brown, entire, hya- 

 line on margin, about 1 mm. long and as wide, prominentiy 



setose on back. Kyushu (Iki, Hirato, Yakushima) ; very rare. 



Bonins, Formosa, China, Malaysia, Polynesia to Australia, 



and New Zealand. 



6. Adiantum flabellulatum L. A. juscum Retz.; A. 



amoenum Wall, ex Hook. & Grev. Okinawa-kujaku. 



Rhizomes rather stout, short, densely clothed with yellow- 

 brown, membranous, linear to broadly linear lustrous scales 



4-5 mm. long; fronds firm, tufted; stipes 10-30 cm. long, 

 black-purple to dark brown, lustrous, with 2 slender ridges on 

 upper side, 1-2 mm. across, scaly near base; blades pedately 

 divided, bipinnate; pinnae 3-10, lanceolate, 5-10 cm. long, 

 1.5-2.5 cm. wide, obtuse to subacute, short-petiolulate, the 

 rachis densely dark brown setulose on upper side; pinnules 

 5-18 pairs, somewhat coriaceous, elliptic, obovate to ovate, 7-15 

 mm. long, 4-7 mm. wide, oblique, rounded to obtuse, broadly 

 cuneate at base, minutely toothed on upper margins, glabrous, 

 obsoletely veined on both sides; sori few on each pinnule, con- 

 tiguous; false indusia transversely linear-oblong, 1-1.2 mm. 

 long, 1-2 mm. wide, contiguous, glabrous, dark brown, entire. 



Kyushu (Yakushima) ; rare. Ryukyus, Formosa, China 



to India, and Malaysia. 



7. Adiantum pedatum L. A. pedatum var. kamtschati- 

 ctim Rupr. & var. aleuticum Rupr. Kujaku-shida. Rhi- 

 zomes short-creeping, with dark brown, lustrous, narrowly 

 lanceolate scales 4-5 mm. long; fronds glabrous throughout, 

 deciduous; stipes dark purple to purple-brown, lustrous, 

 smooth, 20-50 cm. long, 2-3.5 mm. across at base, bifid at 

 apex; blades flabellate, pedately divided, bipinnate; pinnae 8- 

 23, short-petioluled, linear-lanceolate, 18-30 cm. long in the 

 median, 2-4 cm. wide, obtuse, the rachis purple- to red-brown, 

 lustrous, nearly terete; pinnules many, membranous, spreading, 

 subovate, obtuse, straight to slighdy recurved and entire on 

 posterior margin, truncate to convex and lobulate on anterior 

 margin, somewhat glaucous beneath, very short-petiolulate, 

 slenderly veined; sori few on the anterior margin of the pin- 

 nules, solitary on a lobule; false indusia transversely oblong to 

 lanceolate, about 1 mm. long, 1.5-3 mm. wide, hyaline on mar- 

 gin. June-Oct. Woods in mountains; Hokkaido, Honshu, 



Shikoku; rather common. China, Korea, Manchuria, e. Si- 

 beria, Sakhalin, s. Kuriles, Kamchatka, and N. America. 



Fam. 13. PARKERIACEAE Mizu-warabi Ka Waterfern Family 



Aquatic or subaquatic; rhizomes short, erect, sparsely brown-scaly; fronds pinnate, or pinnately decompound, glabrous, 

 dimorphic, the fertile ones larger, more finely divided, with longer and narrower pinnules than the sterile, often proliferous in 



the axils; veins anastomosing; sporangia sessile on the veins, large, enclosed by the reflexed margins of the pinnules. One 



genus, comprising a few species in the warmer regions of the world. 



1. CERATOPTERIS Brongn. Mizu-warabi Zoku 



Characters of the family. 



1. Ceratopteris thalictroides (L.) Brongn. Acrosti- 

 chum thalictroides L.; A. siliquosum L.; Pteris thalictroides 



(L.) Sw.; C. gaudichaudii Brongn. Mizu-warabi. Fronds 



tufted, usually dimorphic; sterile blades ovate to ovate-deltoid, 

 3-20 cm. long, 2.5-17 cm. wide, 1- to 4-pinnatiparted; pinnules 

 lanceolate, with few coarse teeth or lobes; veins anastomosing; 



fertile blades ovate, 1- to 3-pinnate, erect, the stipes usually 

 shorter than the blades, the ultimate pinnules linear-subulate, 



2-7 cm. long, 2-3 mm. wide, obtuse, entire, sessile. Aug.- 



Oct. Ponds and paddy fields; Honshu (Kanto Distr. and 



westw.), Shikoku, Kyushu; common. s. Korea, Ryukyus, 



Formosa, China to India, Malaysia, and Polynesia. 



Fam. 14. DAVALLIACEAE Shinobu Ka Davallia Family 



Mostiy epiphytic ferns; rhizomes creeping, rarely suberect, dictyostelic, scaly; stipes mosdy interrupted and jointed with the 

 rhizomes, rarely (Nephrolepis) approximate and not jointed; fronds pinnate, simple to decompound; veins free; sori sub- 

 marginal or dorsal, terminal or very rarely dorsal on the vein, usually indusiate. About 12 genera with about 300 species in 



the warmer regions of the world. 



lA. Stipes jointed at base with the rhizomes; pinnae not jointed at base. 



2A. Indusium fi.xed by base and sides 1. Davallia 



2B. Indusium attached only at base 2. Humata 



IB. Stipes not jointed at base; pinnae jointed at base 3. Nephrolepis 



