ASPIDIACEAE 



69 



Var. caudipinna (Nakai) H. Ito. D. caudipinna Nakai 



Hachijo-beni-shida. Blades longer, with ascending 



pinnatilobed pinnules to 6 cm. long; scales more dense. 



Warmer parts of our area. 



Var. purpurascens H. ltd. D. purpttrella Tagawa 



MuRASAKi-BENi-sHiDA. Stipes and rachis suffused purple. 



Kyushu (Yakushima). Ryukyus. 



Var. cystolepidota (Miq.) Nakai. Aspidium cystolepi- 

 doUim Miq.; D. cystolepidota (Miq.) C. Chr.; D. nipponensis 

 Koidz. 0-t6goku-shida. Blade usually abruptly acumi- 

 nate, the lowest pinnae wider with a wider posterior side; 

 pinnules broader, often incurved-toothed to parted; sori smaller. 

 Honshu (Kanto Distr. and westw.), Shikoku, Kyushu. 



Var. ambigens (Koidz.) Nakai. D. cystolepidota var. am- 

 higens (Koidz.) H. Ito; D. nipponensis var. ambigens Koidz. 



0-t6goku-shida. Similar to the preceding variety, the 



blades elliptic, the pinnules obtuse, the fertile blades linear- 

 oblong, often subentire and slightly crisped on margin. 



Honshu (Kanto Distr. and westw.), Shikoku, Kyushu; rare. 



25. Dryopteris hondoensis Koidz. D. rhombeo-ovata 



H. Ito O-BENi-SHiDA. Rhizomes ascending, stout; stipes 



20-50 cm. long, brownish, moderately scaly; scales more num- 

 erous near the base, lanceolate or narrowly so, the lower ones 

 8-12 mm. long, upper ones 3-5 mm. long, long-acuminate, 

 lustrous, entire, spreading; blades ovate to narrowly so, 30-50 

 cm. long, 20-30 cm. wide, acuminate, the rachis usually brown- 

 ish, with sparse, broadly linear to filiform, brown scales 2-4 

 mm. long; pinnae obliquely spreading, deltoid-lanceolate, 3-5 

 cm. wide, acuminate, distincdy periolulate, the lowest pinnae 

 slightly broader, oblique; pinnules broadly lanceolate to nar- 

 rowly oblong-ovate, 15-40 mm. long, 6-15 mm. wide, acute to 

 obtuse, broadly cuneate at base, with scattered, short-appressed, 

 hairlike scales beneath, glabrous above, the upper ones coarsely 

 incurved-toothed, the lower pinnately parted, the costules be- 

 neath with small appressed ovate-saccate scales; sori more or 

 less median in 2 rows on ijie pinnules; indusia orbicular-reni- 



form, entire, about 1 mm. across. Honshu (s. Kanto 



through Tokaido to Kinki and Chugoku Distr.), Shikoku, 

 Kyushu. 



26. Dryopteris varia (L.) O. Kuntze. Polypodium 

 varium L.; Nephrodium varium (L.) Desv.; Polystichiim 

 varizim (L.) Presl; Lastrca opaca Hook.; D. yabei Hayata; D. 



matsuzoana Koidz.; D. ogawae H. Ito Itachi-shida-modo- 



Ki. Rhizomes stout; fronds evergreen; stipes few, 20-60 cm. 

 long; scales linear to subulate, 3-10 mm. long, filiform at the 

 tip, entire, black-brown, dilated, lobed, ciliate, closely ap- 

 pressed to the stipe at base, the basal scales dense, 1-2.5 cm. 

 long, 1-2 mm. wide, lustrous, brown to black-brown, scarcely 

 dilated at base; blades broadly ovate to elliptic, 25-50 cm. long, 

 20-30 cm. wide, abrupdy contracted and often subtruncate 

 with a deltoid-lanceolate acuminate tail at the tip, bipinnate; 

 pinnae 6-9 pairs, sometimes more, broadly linear, 10-25 cm. 

 long, 2-3.5 cm. wide, gradually acuminate, short-petiolulate; 

 pinnules oblong to linear-oblong, more or less falcate, 1-2.5 

 (-3.5) cm. long, 5-8 mm. wide, acute to obtuse, usually 

 auricled, subcordate to cuneate at base, few-toothed, some- 

 times lobulate or pinnatiparted, sessile; sori in 2 rows, nearer 

 the margin than the costule; indusia orbicular-reniform, nearly 

 entire, about 1.2 mm. across. Honshu (Kanto and To- 

 kaido to Kinki and Chugoku Distr.), Shikoku, Kyushu; rather 

 rare. Ryukyus, Formosa, China to Indochina, and Philip- 

 pines; very variable. 



Var. selosa (Thunb.) Ohwi. Polypodium setosum Thunb.; 

 Polystichum setosum (Thunb.) Presl, non Schott; P. thun- 



bergii Koidz. Itachi-shida. Blades gradually narrowed 



from below the middle to the tip. Woods in hills and low 



mountains; Honshu (Kanto Distr. and westw.), Shikoku, 

 Kyushu; very common. Korea and China. 



Var. subtripartita (Fr. & Sav.) H. Ito. Aspidium lacerum 

 var. subtripartitum Fr. & Sav.; A. lacerum var. bipinnatum 

 Fr. & Sav.; Polystichum varium var. subtripartitum (Fr. & 

 Sav.) Nakai; Nephrodium bissetianum Bak.; D. bissetiana 

 (Bak.) C. Chr.; P. bissetianum (Bak.) Nakai; P. pacificum 



Nakai O-itachi-shida. Blades often larger, often tripin- 



nately parted to tripinnate, the pinnules often broadly lanceo- 

 late, acute, toothed; sori median or somewhat closer to the 



costules than to the margin. Honshu (Kanto Distr. and 



westw.), Shikoku, Kyushu. 



Var. sacrosancta (Koidz.) Ohwi. D. sacrosancta Koidz.; 

 Polystichum sacrosanctum (Koidz.) Koidz.; D. \obayashii 

 Kitag. HiME-iTACHi-sHiDA. Similar to the preceding va- 

 riety but the blades thinner, firmly herbaceous to subcoriaceous, 



dull; pinnules more deeply and finely parted. Honshu 



(Kanto Distr. and westw.), Shikoku, Kyushu. Korea and 



Manchuria. 



27. Dryopteris sordidipes Tagawa. Yocore-itachi- 

 sHiDA. Closely allied to the preceding species, especially var. 

 setosa; stipes 20-50 cm. long, with dense blackish appressed 

 scales; blades firmly herbaceous to thinly coriaceous, ovate to 

 oblong-ovate, 25-45 cm. long, 20-30 cm. wide, acuminate, 

 bipinnate, the scales of rachis dense, black, appressed, linear to 

 nearly fiiliform, dilated; pinnae peuolulate, the lowest on a 

 rather prominent petiolule 1.5-2 cm. long, the rachis beneath 

 with appressed rusty-brown to blackish nearly filiform scales 

 dilated at base; pinnules broadly lanceolate, deltoid-lanceolate, 

 or narrowly oblong, 1-3 cm. long, 3-20 mm. wide, obtuse to 

 acute, often auricled at base, toothed, pinnately lobed to 

 parted and the lower ones very short-petiolulate, the lowest 

 pinnules of the lowest pinnae largest, to nearly 10 cm. long, 

 pinnate in lower half; sori median; indusia orbicular-reniform, 



enure, usually less than 1 mm. across. Kyushu (s. distr. 



inch Yakushima). Ryukyus and Formosa. 



28. Dryopteris saxifraga H. Ito. Iwa-itachi-shida. 

 Rhizomes stout, covered with the basal stubs of old stipes; 

 stipes several, 10-20 cm. long, rather stout, densely scaly, straw- 

 colored, brown and thickened at base; scales spreading, linear 

 to broadly so, black-brown, the upper ones and those of the 

 rachis 3-7 mm. long, with a pale-brown dilated or saccate base, 

 the lower ones longer, 7-12 mm. long, not prominendy dilated 

 at base; blades oblong-ovate to ovate, 15-30 cm. long, 10-15 

 cm. wide, acuminate; pinnae short-petiolulate; pinnules linear- 

 oblong to lanceolate, acute, cuneate at base or decurrent on the 

 axis, the lower ones pinadfid to pinnatiparted; scales on 

 costas beneath and on rachis membranous, ovate, inflated, 0.5-1 

 mm. long, rusty-brown, often with a hairlike tail at the tip; 

 sori in 2 rows on the pinnules, median or nearer to die costules; 



indusia orbicular-reniform, entire, about I mm. across. 



Rocks; Hokkaido, Honshu, Shikoku, Kyushu (high mts.). 



Korea and Manchuria. 



29. Dryopteris formosana (Christ) C. Chr. Aspidium 

 jormosanum Christ; Polystichum constuntissimum Hayata; D. 

 phacolepis Hayata; D. I{odamac Hayata; D. tal{euchiana 



Koidz.; Polystichum varium var. curylcpidotum Rosenst. 



Takasago-shida. Rhizomes short, ascending, covered with 



