74 



ASPIDIACEAE 



mm. wide, acuminate to acute with an obtuse tip, scarcely 

 narrowed at base; pinnae 4-8 pairs, membranous, alternate, 

 ovate to ovate-deltoid, 5-15 mm. long, 5-10 mm. wide, obtuse 

 to rounded at the tip, sessile, thinly pilose on both sides; 

 pinnules elliptic to rounded; veinlets reaching the margin, 

 simple to once forked; sori 1-5 on each pinnule, nearer the 

 margin than the costule; indusia membranous, orbicular-reni- 

 form, about 0.5 nun. across, sometimes oblique, ciliate, pilose 



on back. Shaded walls and moist rocks; Honshu (s. Kinki 



Distr. and westw.), Shikoku, Kyushu. Ryukyus, Formosa, 



and Korea. 



11. Lastrea japonica (Bak.) Copel. Nephrodium ja- 

 ponicum Bak.; Dryopteris japonica (Bak.) C. Chr.; D. for- 

 mosa Nakai, non Maxon; D. castanea Tagawa; D. japonica 

 var. formosa (Nakai) C. Chr. Harigane-warabi. Rhi- 

 zomes creeping, black-brown, sparsely scaly, 3-5 mm. across; 

 fronds deciduous; stipes rather slender, 20-60 cm. long, pale 

 green to dark purple-brown, lustrous, sparsely scaly; scales 

 membranous, lanceolate, 4-6 mm. long, remotely dentate, 

 pubescent to nearly glabrous, brown, deciduous; blades deltoid- 

 ovate to oblong, 20-50 cm. long, 15-25 cm. wide, acuminate, 

 the rachis and costas prominendy short-hairy on upper side; 

 pinnae 10-18 pairs, thinly herbaceous, broadly linear, 8-20 

 mm. wide, acuminate, mostly reflexed, slighdy narrowed at 

 base, sessile, pinnatiparted, with spreading short hairs especially 

 on the costas beneadi, thinly ascending-pilose above; pinnules 

 narrowly oblong, 2.5-3.5 mm. wide, crenate to subentire; vein- 

 lets simple; sori in 2 series between the cosmle and margin; 

 indusia membranous, rounded-reniform, about 1 mm. across, 



pale, short-pilose on back. Hokkaido, Honshu, Shikoku, 



Kyushu; common. Korea, China, and Formosa. 



Var. musashiensis (Hiyama) Honda. Iwa-harigane- 



WARABi. Scales darker brown; indusia nearly glabrous. 



Honshu (w. Kanto to s. Shinano Prov.). 



Var. glabrata (Ching) Ohwi. Thelypteris japonica var. 



glabrata Ching Korai-yawara-shida. Plant Glabrescent. 



Occurs rarely in our area. 



Lastrea simozawae (Tagawa) Tagawa. Thelypteris 



simozawae Tagawa Churei-hashigo-shida. Rhizomes 



short-creeping; blade nearly destimte of sessile discoid glands 



on undersurface. A Formosan species reported to occur in 



Kyushu (Yakushima). 



12. Lastrea nipponica (Fr. & Sav.) Copel. Aspidium 

 nipponicum Fr. & Sav.; Dryopteris nipponica (Fr. & Sav.) C. 

 Chr.; Thelypteris nipponica (Fr. & Sav.) Ching; D. nipponica 



var. borealis Hara ^Nikko-shida. Rhizomes creeping, 



rather densely covered with the basal stubs of old stipes; stipes 

 slender, 15-30 cm. long, the fertile up to 40 cm. long, straw- 

 colored, dark brown at base, very sparsely scaly; scales ovate, 

 2-4 mm. long, abruptly acuminate, dark brown, with a few 

 spinelike teeth; blades thinly herbaceous, broadly oblanceolate 

 to oblong, 20-40 cm. long, 8-15 cm. wide, fertile ones often 

 narrower, acuminate, somewhat narrowed at base; sterile 

 pinnae contiguous, the fertile distant, broadly linear to lanceo- 

 late, 8-15 mm. wide, acuminate with an acute to subobmse 

 tip, sessile, with a stipulelike lobe at base, thinly pilose, pin- 

 natiparted, the fertile pinnae often with recurved margins, the 

 costas pilose above, white-villous beneath at least on lower 

 half; veinlets usually simple, reaching the margin; indusia 

 membranous, orbicular-reniform, glandular and sometimes 



pilose, 0.5-0.7 mm. across. Hokkaido, Honshu (centr. and 



n. distr.). Korea and China. 



13. Lastrea beddomei (Bak.) Bedd. Nephrodium bed- 



domei Bak.; Dryopteris beddomei (Bak.) O. Kuntze Ho- 



soBA-SHORiMA. Rhizomes long-creeping, about 2 mm. across, 

 sparsely scaly while young; sterile fronds 20-50 cm. long, the 

 fertile longer, 40-60 cm. long; stipes slender, straw-colored, 

 dark purple-brown toward base, lustrous, 5-15 cm. long, very 

 thinly scaly at base; scales dull brown, ovate, subentire; blades 

 broadly lanceolate, 6-10 cm. wide, long-acuminate, abruptly 

 narrowed at base, with 5-10 pairs of much reduced auriclelike 

 pinnae at base, bipinnatiparted, the rachis pale green, slender, 

 short-pilose on upper side; pinnae spreading, thinly herbaceous 

 to membranous, linear-lanceolate, 5-7 mm. wide, long-acumi- 

 nate, sessile, thinly appressed-pilose above and on margin, 

 pubescent beneath and on costas, the lower reduced pinnae 

 5-15 mm. long; pinnules narrowly oblong, nearly entire, 2-3 

 mm. wide; veinlets simple, reaching the margin; sori in 2 

 series, nearer the margin than the costule; indusia small, 

 orbicular-reniform to oblong-cordate, 0.2-0.4 mm. across, usu- 

 ally long-pilose. Honshu (Suruga Prov.), Shikoku, Kyu- 

 shu. s. Korea, Formosa to Malaysia, and India. 



14. Lastrea laxa (Fr. & Sav.) Copel. Aspidium laxum 

 Fr. & Sav.; Dryopteris laxa (Fr. & Sav.) C. Chr.; Thelypteris 

 laxa (Fr. & Sav.) Ching ^Yawara-shida. Rhizomes long- 

 creeping, sparsely pilose, scaly, 2-3 mm. across; fronds decidu- 

 ous, sofdy short-pilose; stipes 15-35 cm. long, slender, brownish 

 toward base, thinly scaly while young; scales lanceolate, 1.5-2 

 mm. long, minutely pilose; blades broadly lanceolate to deltoid- 

 ovate, 25-50 cm. long, 10-20 (-25) cm. wide, acuminate, not 

 narrowed at base, the rachis and costas short-pilose above; 

 pinnae membranous, lanceolate or linear-lanceolate, 1-2 cm. 

 wide, long-acuminate, the lower pinnae usually narrowed 

 at base, sessile, short-pilose on lower side; pinnules oblong to 

 oblong-lanceolate, 2.5-5 mm. wide, obtuse to acute, coarsely 

 and regularly toothed; veinlets simple to forked, not reaching 

 the margin; sori median, in 2 rows on the pinnules; indusia 



membranous, orbicular-reniform, pilose. Honshu, Shikoku, 



Kyushu; common. Formosa, Korea, and China. 



15. Lastrea graeilescens (Bl.) Moore. Aspidium gra- 

 cilescens Bl.; Thelypteris graeilescens (Bl.) Ching; Dryopteris 

 graeilescens (Bl.) O. Kuntze; D. sublaxa Hayata; D. arisanensis 

 Rosenst. Shima-yawara-shida. Rhizomes short-creep- 

 ing; stipes 15-40 cm. long, the sterile shorter than the fertile, 

 slender, puberulous; scales lanceolate, 1-2 mm. long, pale 

 brown, entire; blades lanceolate, 25-35 cm. long, 7-12 cm. 

 wide, long-acuminate, not narrowed at base, the rachis with 

 short spreading-hairs on upper side; pinnae firmly mem- 

 branous, linear-lanceolate, 1-1.5 cm. wide, falcate, caudate, 

 sessile, nearly glabrous on upper side, with prominent short 

 ascending-hairs on the costas, very thinly and minutely pilose 

 beneath and on margin; pinnules narrowly oblong, subentire; 

 veins pinnate, the veinlets simple, not reaching die margin; 

 sori in 2 series, median; indusia orbicular-reniform, about 0.5 



mm. across, often unequal, erose to subentire. Kyushu 



(Yakushima) ; rare. Formosa to Malaysia and Polynesia. 



16. Lastrea hattorii (H. Ito) Tagawa. Dryopteris hat- 



torii H. Ito; Thelypteris hattorii (H. Ito) Tagawa ^Yoko- 



gura-hime-warabi. Closely related to No. 14, differing 

 chiefly in the deltoid tripinnate blades, the pinnae broadly 

 lanceolate, 4-5 cm. wide, the lowest ones petiolate, the lower 

 pinnules sessile, contracted at base; stipes pale brown, smooth, 

 lustrous, very short-pilose; blades deltoid to deltoid-ovate, 

 20-35 cm. long, 15-28 cm. wide, long-acuminate; pinnae about 



