98 



POLYPODIACEAE 



3. Polypodium fauriei Christ. P. vulgare var. japoni- 

 cum Fr. & Sav.; P. japonicum (Fr. & Sav.) Maxon, non Houtt. 



OsHAGUji-DENDA. Rhizoiiies rather slender, 2-3 mm. 



across, long-creeping, densely scaly, the scales brown, mem- 

 branous, spreading, ovate, 2-3 mm. long, abruptly contracted 

 to a short filiform point; stipes rather short, 3-6 cm. long, 

 straw-colored, glabrous on upper portion, slightly scaly at 

 base; blades chartaceous to herbaceous, narrowly ovate to 

 broadly lanceolate, 5-20 cm. long, 2.5-8 cm. wide, usually 

 slightly narrowed at base, glabrous on upper side, sparsely 

 crisped-pubescent beneath, pinnately parted, the rachis raised 

 on both sides; segments 15-25 pairs, horizontally spreading, 

 linear-lanceolate to broadly linear, 3-5 mm. wide, obtuse to 

 subacute, usually obsoletely crenate toward the apex, the costas 

 slender, slightly raised on both sides, the veins not visible; sori 



orbicular, medial. Tree-trunks and rocks in mountains; 



Hokkaido, Honshu, Shikoku, Kyushu, rather rare. s. Ku- 



riles and Korea (Quelpaert Isl.). 



4. Polypodium niponicum Mett. Marginaria niponica 



(Mett.) Nakai Aone-kazura. Rhizomes long-creeping, 



4-5 mm. across, green, somewhat glaucous, fleshy, sparsely 

 scaly, the scales appressed, deltoid-ovate, 1.5-2 mm. long, 

 acuminate, rounded to subcordate at base, peltately attached, 

 clathrate; stipes straw-colored, 7-15 cm. long, nearly glabrous; 

 blades broadly lanceolate to oblong-ovate, 15-30 cm. long, 

 5-10 (-12) cm. wide, pinnately parted, puberulent on upper 

 side, densely so and often velvety beneath; segments 15-25 

 pairs, horizontally spreading, the lower 1 or 2 pairs some- 

 times slightly deflexed, oblong-lanceolate to narrowly lanceo- 

 late 6-10 mm. wide, obtuse to acute, subentire, the costas very 

 slender, the veins scarcely visible; sori orbicular, nearer the 



costa than the margin. ^Mossy rocks and tree-trunks in 



hills and low mountains; Honshu (Musashi and Sagami Prov. 

 and westw.), Shikoku, Kyushu. s. China. 



5. Polypodium formosanum Bak. Marginaria formo- 



sana (Bak.) Nakai; P. liu\iuense Christ Taiwan-aone- 



KAZURA. Rhizomes long-creeping, stout, 4-6 mm. across, 

 terete, somewhat glaucous, nearly naked except for scattered 

 minute scales toward the tip; stipes terete, pale brown to 

 straw-colored, slighdy lustrous, 15-30 cm. long, 2-3 mm. 

 across, glabrous or nearly so; blades herbaceous, narrowly 

 oblong-ovate, 30-50 cm. long, 10-15 cm. wide, pinnately 

 parted, thinly puberulent on both sides, the rachis short- 

 pilose above; segments 20-30 pairs, horizontally spreading, lin- 

 ear-lanceolate, 1-1.5 cm. wide, acute, nearly entire; costa slen- 

 der, thinly short-pilose on upper side; sori slightly nearer the 



costa than the margin. Kyushu (Yakushima); rare. 



Formosa. 



6. Polypodium someyae Yatabe. Marginaria someyae 



(Yatabe) Nakai ^Myogi-shida. Rhizomes long-creeping, 



3-4 nun. across, prominendy scaly, especially at the base of 

 stipes, the scales linear-lanceolate, 4-5 mm. long, long- 

 acuminate, ciliolate, minutely clathrate; stipes straw-colored to 

 pale green, somewhat lustrous, slender, glabrous on upper 

 portion with a fascicle of scales at base; blades thinly 

 herbaceous, ovate to narrowly so, 12-25 cm. long, 7-12 cm. 

 wide, abruptly contracted above and caudate at the tip, pin- 

 nately parted, nearly glabrous beneath, puberulent on upper 

 side, especially on the rachis and costas; segments 7-15 pairs, 

 spreading, linear-lanceolate, 6-15 mm. wide, obtuse, usually 

 slighdy falcate, crenately toothed, the costa slender, raised on 

 both sides, slightly flexuous, decurrent on the rachis, the veins 



more or less visible on both sides; sori medial. ^Mossy 



rocks in mountains; Honshu (Musashi and Kotsuke Prov.), 

 Shikoku; very rare. 



3. PLEOPELTIS Humb. & Bonpl. Noki-shinobu Zoku 



Epiphytic; rhizomes elongate, dictyostelic, scaly; fronds coriaceous, jointed at base to the rhizome, simple or rarely pinnatifid, 

 entire, with peltate scales on one or both sides, or nearly naked; veins and veinlets freely anastomosing; sori borne at the union 

 of several veinlets, typically round, rarely elongate or fused and parallel to the costa, protected at least at first by peltate 

 paraphyses with a flat expanded apex. About 40 species, Hawaii, Japan, Philippines, Sumatra, Africa, and tropical America. 



lA. Scales of rhizomes lanceolate, gradually long-attenuate, 2.5-4 mm. long. 

 2A. Fronds coriaceous, the veins not distinct. 

 3A. Stipes often very short, 2-30 mm. long. 



4A. Rhizomes 2-3 mm. across; fronds 12-30 cm. long, 5-15 mm. wide; stipes 1-3 cm. long \. P. thunbergiana 



4B. Rhizomes about 1 mm. across; fronds 3—7 cm. long, 2-5 mm. wide; stipes 2—7 mm. long 2. P. onoei 



3B. Stipes slender, 3-6 cm. long; blades 5-10 cm. long, 3-5 mm. wide, rather abruptly narrowed at both ends 3. P. uchiyamae 



2B. Fronds chartaceous when dry, the veins distinct on both surfaces 4. P. clathrata 



IB. Scales of rhizomes ovate, abrupdy acuminate, 1-2 mm. long. 



5A. Rhizomes long-creeping, slender; fronds remote; blades linear-lanceolate, 0.5-1.5 cm. wide 5. P. ussuriensis var. distans 



5B. Rhizomes short-creeping; fronds closer and more numerous; blades usually lanceolate, wider. 



6A. Sori nearer the costa than the margin; blades often acuminate to caudate, sometimes with an isolated pair of sori at the tip. 



6. P. tosaensis 

 6B. Sori between the costa and margin; blades acuminate, sometimes with an obtuse tip, without isolated sori at the tip. 



7. P. annuijrons 



1. Pleopeltis thunbergiana Kaulf. Lepisorus thunber- minutely dentate; fronds evergreen, glabrous, 12-30 cm. long; 



gianus (Kaulf.) Ching; Polypodium lineare Thunb., non stipes 1-3 cm. long; blades coriaceous, linear to broadly so, 



Burm.; Pleopeltis linearis (Thunb.) Moore, non Kaulf.; Poly- 5-15 mm. wide, gradually acuminate, gradually narrowed at 



podium lineare var. thunhergianum (Kaulf.) Takeda; Pleopel- base, entire, somewhat recurved on margin, entire, dark green 



tis elongata sensu Kunze, non Kaulf. Noki-shinobu. above, paler beneath, the costa prominent on both sides. 



Evergreen glabrous fern; rhizomes long-creeping, 2-3 mm. usually with minute ovate appressed scales on lower half be- 

 across, densely scaly, the scales ascending, linear-subulate, 3-4 neath; sori round, on upper half of blades, close to nearly 

 mm. long, dilated and ovate-cordate at base, dark brown, contiguous at maturity, medial. Tree-trunks and rocks in 



