46 



Pteridaceae 



1. Pleurosoriopsis makinoi (Maxim.) Fomin. Gymno- 

 gramme makinoi Maxim.; Anogramme ma\inoi (Maxim.) 

 Christ Karakusa-shida. Terrestrial, evergreen fern; rhi- 

 zomes slender, scarcely 1 mm. across, long-creeping, densely 

 red-brown woolly, loosely leaved, with few fugacious jointed 

 short hairs at the tip; fronds 3-7 cm. long; stipes slightly 

 shorter to longer than the blade, straw-colored, with red-brown 

 somewhat woolly hairs 1-2 mm. long on lower half, with 

 spreading pale brown jointed flexuous hairs 0.2-0.3 mm. long 

 on upper half; blades herbaceous, ovate to ovate-oblong, 2-5 

 cm. long, 1-1.5 cm. wide, obtuse to subacute, 1 (-2) -pinnate, 

 with numerous spreading brown jointed hairs about 0.3 mm. 



long on the rachis and on the segments of both sides, especially 

 on margin; pinnae 3-5 pairs, obliquely spreading, ovate, ob- 

 tuse, cut into a few segments, usually short-petiolulate; pin- 

 nules oblong, 1-1.5 mm. wide, obtuse, entire or 2- or 3-lobed; 

 veins obsolete on both sides, solitary in the lobes, not reaching 

 the margin; sori along the veins on underside of the pinnules, 

 margin; sori along the veins on underside of the pinnules, 

 often confluent with the adjacent ones, rusty-brown, exindusi- 



ate. Among mosses on rocks in mountains; Hokkaido, 



Honshu, Shikoku, Kyushu; rare. ^Korea, China, Manchuria, 



and e. Siberia. 



16. ADIANTUM L. Hakone-shida Zoku 



Terrestrial; rhizomes long-creeping or short, scaly, solenostelic; stipes scaly only at base, lustrous; blades membranous to 

 coriaceous, 1- to 3-pinnate, or decompound, or sometimes simple, glabrous or rarely hairy; veins free or rarely anastomosing; 



sori marginal, the sporangia along the veins, on underside of the reflexed margins (false indusium) of pinnules. ^More than 



200 species, widely distributed, most abundant in S. America. 



lA. Ultimate pinnules cuneate to orbicular, equilateral; sori on outer margin. 



2A. Blades 2- to 4-pinnate, rarely simply pinnate, not proliferous at the tip; pinnules cuneate at base; rhizomes creeping. 



3A. Ultimate pinnules not lobed, subcoriaceous; sori mostly solitary on the center of upper margin \. A. monochlamys 



3B. Ultimate pinnules mostly 3- to 5-palmately lobed, membranous; sori few on a pinnule, usually solitary on a lobe. 



2. A. capillus-veneris 

 2B. Blades simply pinnate, often elongate and proliferous at the tip; pinnae orbicular, thinly chartaceous, usually shallowly 2- to 4- 



lobulate; rhizomes short 3. A. capillus-junonis 



IB. Ultimate pinnules broadly falcate-lanceolate to obovate, dimidiate; sori on anterior margin. 



4A. Blades simply pinnate, glabrous, often elongate and proliferous at the tip; false indusium glabrous ^. A. edgeworthii 



4B. Blades with ternately to pedately divided pinnae, if simply pinnate, the pinnae and false indusium more or less setose. 

 5A. Blades, at least in part, sometimes setose. 



6A. Rachis glabrous; pinnules membranous, thinly setose at least along the posterior margin; false indusium cordate, distant, 



prominently setose on back S. A. diaphanum 



6B. Rachis densely setulose on upper side; pinnules somewhat coriaceous, glabrous; false indusium transversely linear-oblong, con- 

 tiguous, glabrous d. A. fabellulatum 



5B. Blades glabrous throughout 7. A. pedatum 



1. Adiantum monochlamys Eaton. A. venustum var. usually glaucous beneath, slenderly veined on both sides, mi- 



monochlamys (Eaton) Luerss.; A. veitchii Hance Hakone- nutely toothed along the upper margin; sori few on a pinnule, 



SHiDA, Hakone-so. Rhizomcs short-creeping, 3-4 mm. usually solitary on each of the ultimate pinnules; false indusia 



across, with purple-brown to dark brown broadly linear scales transversely oblong or slightly reniform, glabrous, about 1.5 



3-4 mm. long; fronds evergreen, glabrous; stipes 10-20 cm. mm. long, 2-3.5 mm. wide. Rocky cliffs; Honshu (Sagami 



long, purple-brown to dark brown, lustrous, terete; blades nar- Prov., Izu Isls.), Shikoku, Kyushu; rare. Widely distri- 



rowly triangular-ovate, 10-25 cm. long, 4-8 cm. wide, smooth, buted in the tropics and subtropics of both hemispheres. 



3- or 4-pinnate, the rachis lustrous, purple-brown, flexuous; 3. Adiantum capillus-junonis Rupr. A. cantoniense 



pinnae 4-6 on each side, the upper ones gradually reduced; Hance Horai-kujaku. Rhizomes small, short, clothed 



pinnules subcoriaceous, obtriangular, 5-12 (-15) mm. long, with broadly linear brown scales about 3 mm. long; fronds 

 4-8(-12) mm. wide at the truncate-rounded toothed apex, tufted, slender, glabrous; stipes 1-7 cm. long, dark purple- 

 cuneate in lower half, short-petiolate, slighdy lustrous on up- brown, lustrous, 0.3-0.5 mm. across; blades oblong-lanceolate, 

 per side, often slightly glacuous beneath; veins slender, obsolete, 6-20 cm. long, 2-3 cm. wide, simply pinnate, the rachis purple- 

 palmate; sori mostly solitary in the center of upper margin; brown, very slender, sometimes much elongate and proUferous 

 false indusia reniform, 2-3 mm. long, 2.5-4 mm. wide, gla- at the tip; pinnae thinly chartaceous, orbicular, 1-2 cm. long 



brous, entire. ^Mountains; Honshu (Uzen and Rikuzen and as wide or slighdy wider than long, minutely undulate- 



Prov. southw.), Shikoku, Kyushu; common. s. Korea, For- crenate, shallowly 2- to 4-lobulate on upper margin, the peti- 



mosa, and China. olules 2-3 mm. long; veins numerous, slender, parallel; sori 2- 



2. Adiantum capiUus-veneris L. Horai-shida. Rhi- 4 on a pinnule, transversely oblong, 1.2-1.5 mm. long, 1.5-2.5 



zomes creeping, 2-3 mm. across, with lustrous, brown, broadly mm. wide, usually free, rarely confluent. Kyushu (Buzen 



linear scales 2-2.5 mm. long; fronds glabrous; stipes 2-15 cm. Prov.); very rare. China and Manchuria. 



long, slender, dark purple-brown, lustrous, scaly at base; blades 4. Adiantum edgeworthii Hook. A. caudatum var. 



broadly lanceolate to triangular-ovate, 4-20 cm. long, 2-10 cm. rhtzophorum Wall, ex C. B. Clarke; A. caudatum var. eige- 



wide, simply pinnate, bi- to partially tripinnate, the rachis worthii (Hook.) Bedd. Otome-kujaku. Rhizomes small, 



purple-brown, lustrous, slighdy flexuous, slender; pinnae usu- short, the scales about 2 mm. long, linear, lustrous, black- 

 ally 7-9 pairs, 3-4 pairs in depauperate blades, periolulate; brown with paler margins; fronds glabrous, tufted; stipes 4-8 

 pinnules membranous, flabellate to broadly cuneate, 7-15 mm. cm. long, slender, purple-brown, sparsely scaly, about 0.5 mm. 

 long, nearly as wide, palmately 3- to 5-lobed, green above, across; blades simply pinnate, lanceolate, 5-12 cm. long, 15-20 



