102 



POLYPODIACEAE 



2A. Rhizomes long-creeping; blades chartaceous, simple, brownish when dried, cuneately narrowed at base; sori mosdy round, 2—2.5 

 mm. across 2. M. buergerianum 



2B. Rhizomes short-creeping; blades herbaceous, usually pinnately parted, rarely simple, green when dried, long-decurrent on the stipe; 

 sori round to oblong, sometimes short-linear, 1-1.5 mm. across 3. M. dilatatum 



1. Microsorium scolopendria (Burm.) Copel. Poly- 

 podium scolopendria Burm.; Phymatodes scolopendria 

 (Burm.) Ching; Polypodium phymatodes L.; Drynaria phyma- 

 todes (L.) Fee; Phymatodes vulgaris Presl Okinawa-ura- 



BosHi, Okinawa-kuriha-ean. Rhizomes long-creeping, rather 

 stout, grayish, sparsely scaly, tlie fronds remote, the scales 

 ascending, narrowly deltoid-lanceolate, 4-5 mm. long, acumi- 

 nate, ciliolate, with oblong to elliptic dark brown cell walls, 

 peltately attached; stipes 10-20 cm. long, straw-colored, naked, 

 rather stout, lustrous, nearly terete; blades chartaceous-coria- 

 ceous, usually ovate, 10-30 cm. long, pinnately parted or the 

 small ones sometimes simple and lanceolate, nearly truncate 

 and abruptly narrowed at base, glabrous on both sides, some- 

 what lustrous on upper side; costa and costules on lobes 

 prominently raised beneath, the veins and veinlets invisible on 

 both sides; segments linear-lanceolate to lanceolate, 8-15 cm. 

 long, 2-3 cm. wide, acuminate to acute, entire, slightly re- 

 curved on margin, the terminal one largest (in ours), the 

 lateral ones obliquely spreading; sori round to elliptic, 3-5 

 mm. across, depressed, in a single row on each side of the costa, 

 or sometimes in a double row. ^Kyushu (Tsushima, accord- 

 ing to H. Ito). Ryukyus, Formosa, s. China to Polynesia, 



Malaysia, Australia, India, and tropical Africa. 



2. Microsorium buergerianum (Miq.) Ching. Poly- 

 podium. buergerianum Miq. Nukaboshi-kuriha-ran. 



Rhizomes long-creeping, 3-4 mm. across, densely scaly, the 

 fronds remote, the scales spreading to ascending, membranous. 



rusty-brown, lanceolate, 4-5 mm. long, acuminate, ciliate, 

 clathrate; stipes 3-12 cm. long; blades simple, chartaceous, 

 lanceolate to narrowly so, 12-30 cm. long, 1.5-5 cm. wide, 

 acute to subobtuse, entire or undulate, glabrous on both sides, 

 cuneately narrowed at base, short-decurrent on the stipe; costa 

 rather slender, raised beneath; sori round, 2-2.5 mm. across. 



Tree trunks and shaded rocks; Honshu (Awa and Izu 



Prov. through Tokaido to s. Kinki Distr.), Shikoku, Kyushu. 



Ryukyus, Formosa, China to Indochina. 



3. Microsorium dilatatum (Bedd.) Sledge. Polypo- 

 dium dilatatum Wall, ex Hook., non Hoffm.; Pleopeltis dilatata 

 Bedd.; M. hancoc\ii (Bak.) Ching; Polypodium hancoc\ii 



Bak. Hokozaki-uraboshi. Rhizomes short-creeping, 5-7 



mm. across, densely scaly, the scales membranous, spreading, 

 deltoid-lanceolate, 5-7 mm. long, filiform at the tip, clathrate; 

 fronds 30-60 cm. long; blades herbaceous, pinnately parted or 

 rarely simple, narrowly oblanceolate, 3-5 cm. wide, abrupdy 

 acuminate, gradually narrowed from about the middle, long- 

 decurrent on the sdpe, glabrous except for a few scattered 

 scales toward the base while young, entire or undulate; seg- 

 ments 1-3 pairs, spreading, lanceolate to ovate, abruptly acute 

 to obtuse; costules rather slender, straw-colored; sori round to 

 oblong, or sometimes short-linear, 1-1.5 mm. across, scattered 



on underside of blade. ^Moist places along streams; Kyushu 



(Yakushima and Tanegashima in Osumi, and Koshiki in 

 Satsuma Prov.). Ryukyus, Formosa, China to Indochina. 



9. COLYSIS Presl Iwa-hitode Zoku 



Terrestrial; rhizomes creeping, dictyostelic, the fronds remote, the scales small, thin, entire or subentire; stipes jointed with the 

 rhizome; blades herbaceous, simple or digitate to pinnate, entire, glabrous; veins anastomosing with simple or hamate veinlets; 



sori in a single series between the veins, sohtary and elongate or few and round; paraphyses absent. ^About 30 species, Africa 



to New Guinea, Queensland, and Japan. 



lA. Sori linear, mostly solitary between the veins. 

 2A. Blades regularly pinnate, scarcely decurrent on the stipe. 



3A. Blades broadly ovate, 10-25 cm. long; pinnae 2-6 pairs; veins and veinlets obscure 1. C. elliptica 



SB. Blades narrowly ovate, 40-60 cm. long; pinnae 7-11 pairs; veins and veinlets usually slightly raised on both sides when dried. 



2. C. pothifolia 

 2B. Blades simple, irregularly pinnatiparted in lower half, prominently decurrent on the stipe. 



4A. Blades mostly pectinately parted in lower half, or simple, decurrent on the stipe, the winged part shorter than the blade. 



3. C. shirttenensis 

 4B. Blades simple, long-decurrent on the stipe, the winged part as long as to longer than the blade, at least in larger fronds. 



4. C. wrightii 

 IB. Sori round to oblong, in one series between the lateral veins, oblique to the rachis; blades simple 5. C. hemionitidea 



1. Colysis elliptica (Thunb.) Ching. Polypodium ellip- 



ticum Thunb. Iwa-hitode. Rhizomes long-creeping, 4-6 



mm. across, greenish, densely scaly, the fronds remote, the 

 scales membranous, about 4 mm. long, acuminate, denticulate, 

 lustrous, clathrate; stipes slender, 20-50 cm. long, straw- 

 colored, naked except for a few deciduous scales toward base; 

 blades herbaceous, broadly ovate, 10-25 cm. long, 10-20 cm. 

 wide, pinnate, tiie rachis narrowly winged at least in upper 

 part; pinnae 2-6 pairs, nearly alike, linear-lanceolate or some- 

 times the sterile lanceolate, 7-15 (-20) cm. long, 8-20 mm. 

 wide, long-acuminate, acute to obtuse at the tip, narrowed at 

 base and decurrent on the narrowly winged rachis, entire. 



rarely crenate-undulate; costa slender, slighdy raised, the veins 

 and veinlets obscure; sori ascending to obliquely spreading, 



linear, 5-15 mm. long, rather remote. Moist woods along 



streams; Honshu (Izu Prov. through Tokaido to s. Kinki 



Distr.), Shikoku, Kyushu. Korea (Quelpaert Isl.), Ryukyus, 



Formosa, China to n. India, and Philippines. 



2. Colysis pothifolia (Hamilt. ex D. Don) Presl. Hemi- 

 onitis pothifolia Hamilt. ex D. Don; Gymnogramme pothifolia 

 (Hamilt.) Spreng.; Polypodium pothifolium (Hamilt.) Mett.; 

 P. ellipticum var. pothifolium (Hamilt.) Makino; C. elliptica 

 var. pothifolia (Hamilt.) Ching O-iwa-hitode. Rhi- 



zomes long-creeping, densely scaly toward the tip, 5-10 mm. 



