Plagiogyriaceae; Cyatheaceae 



49 



2A. Sterile pinnae contracted at base, at least the lower ones; fertile pinnae short-petioluled, at least the lower ones. 



3A. Pinnae in upper third to fourth of the sterile blade decurrent on the winged rachis; terminal pinna pinnatcly lobulate at the base; 



lateral pinnae falcate 2. P. adnata 



3B. Pinnae only of the last few pairs toward tip decurrent on the winged rachis; terminal pinna usually unlobed; lateral pinnae 



straight 3. P. japonica 



2B. Sterile pinnae broadly decurrent on the rachis, not contracted at base; fertile pinnae sessile or short-petiolulatc. 



4A. Fertile pinnae short-petiolulate, apiculate; rachis 2-angled beneath; blades usually with a few pairs of much reduced deflexed 



flabellate or deltoid sterile pinnae at base 4. P. stcnoptera 



4B. Fertile pinnae slightly decurrent on the rachis; rachis of sterile blades flat; blades without reduced pinnae at base. 



5. P. matsumureana 



1. PLAGIOGYRIA (Kunze) Mett. Kiji-no-o-shida Zoku 



Characters of the family. 



1. Plagiogyria euphlebia (Kunze) Mett. Lomaria 

 euphlebia Kunze; Stenochlaena triquetra J. Smith; P. triquetra 



(J. Smith) Mett. O-kiji-no-o. Evergreen; rhizomes 



stout, short; fronds crowded, glabrous, simply pinnate, to 1 m. 

 high; stipes 30-60 cm. long; sterile blades 30-60 cm. long, 20- 

 40 cm. wide, the rachis 2-grooved on upper side, rounded on 

 back; pinnae chartaceous, spreading, 10-15 pairs, linear-lanceo- 

 late, 10-20 cm. long, 12-20 mm. wide, long-acuminate, acute 

 at the tip, cuneate-rounded at base, short-petiolulate, minutely 

 toothed toward base, more prominendy so toward the tip, the 

 terminal pinna usually distinct, sometimes few-lobed at the 

 base, the costa slighdy raised, the veins distinct on both sides, 

 usually once-forked, horizontally spreading, closely parallel; 



fertile pinnae short-petiolulate, 7-29 cm. long. Honshu 



(Echigo and Hitachi Prov. and westw.), Shikoku, Kyushu. 



s. Korea (Quelpaert Isl.), Ryukyus, Formosa, China to 



India. 



2. Plagiogyria adnata (Bl.) Bedd. Lomaria adnata Bl.; 

 P. ran\anensh Hayata; P. ya\ushimensis K. Sato; P. adnata 



var. ya\ushimensis (K. Sato) Tagawa Takasago-kiji-no-o. 



Rhizomes stout, ascending to erect; fronds crowded; stipes 5- 

 25 cm. long in the sterile fronds, 20-50 cm. long in the fertile 

 ones, 3-angIed at the base, somewhat 4-angled in upper part; 

 sterile blades 15-30 cm. long, 6-15 cm. wide, the rachis winged 

 at least in the upper portion; pinnae subcoriaceous, spreading, 

 narrowly lanceolate, acute or sometimes the tip elongate, 

 somewhat falcate, serrulate near the tip, decurrent, the basal 

 not decurrent, the terminal pinna pinnately lobulate at the 

 base; veins slender, spreading, usually once-forked, slighdy 

 raised on both sides; fertile pinnae narrowly linear, 4-6 cm. 

 long, the lower ones short-petiolulate sessile but the upper ones 

 scarcely decurrent. Honshu (Izu Prov. and westw.), Shi- 

 koku, Kyushu. Ryukyus, Formosa, China to Malaysia, and 



India. 



3. Plagiogyria japonica Nakai. Kiji-no-o-shida. Rhi- 

 zomes stout, short, densely clothed with the stubs of old stipes; 

 fronds crowded, the sterile ones ascending, the fertile ones 

 longer, erect; stipes 15-40 cm. long in sterile fronds, 30-60 cm. 

 long in the fertile, 3-ang!ed at base; sterile blades 20-40 cm. 

 long, 10-15 cm. wide, the rachis 2-grooved on upper side, 



rounded on lower side, not winged except near top; sterile 

 pinnae 12-16 pairs, spreading, chartaceous-coriaceous, narrowly 

 lanceolate, 5-8 cm. long, 8-12 mm. wide, gradually acuminate, 

 subentire or crenate-toothed, sessile, the upper ones not or very 

 slighdy decurrent on the rachis; veins spreading, once forked 



or simple; fertile pinnae 5-10 cm. long, short-petiolulate. 



Honshu, Shikoku, Kyushu. 



4. Plagiogyria stenoplera (Hance) Diels. Blechnum 

 stenoptertim Hance; Lomaria stenoptera (Hance) Bak.; L. 



concinna Bak. Shima-yama-sotetsu. Rhizomes short, 



stout, erect or ascending, densely covered with the stubs of old 

 stipes; stipes 5-15 cm. long in sterile fronds, 10-30 cm. long in 

 the fertile, acutely trigonous, narrowly winged on the angles 

 while young; sterile blades lanceolate, 25-45 cm. long, 5-12 

 cm. wide, acuminate, abruptly contracted at base, with few 

 pairs of reduced flabellate or deltoid often deflexed pinnae, the 

 rachis flat and scarcely raised above, prominently elevated and 

 2-angled beneath; pinnae of sterile blades 25-32 pairs, herba- 

 ceous, horizontally spreading, linear-lanceolate, acute to short 

 acuminate, widely decurrent, crenate-toothed in lower portion, 

 incurved-toothed toward the tip, the upper pinnae smaller, 

 forming a pinnatilobed terminal pinna with a short tail; fertile 

 fronds erect, with few deflexed pairs of flabellate to deltoid 

 much reduced sterile pinnae at base; fertile pinnae linear, 4-8 



cm. long, apiculate, short-petiolulate. Kyushu (Yaku- 



shima) . Formosa, China, Indochina, and Philippines. 



5. Plagiogyria matsumureana Makino. Lomaria fau- 



riei Christ; P. jauriei (Christ) Matsumura Yama-sotetsu. 



Rhizomes stout, short, erect or ascending, densely covered with 

 the stubs of old stipes; fronds crowded; stipes of sterile fronds 

 7-15 cm. long, compressed-trigonous at base; sterile blades 

 30-60 cm. long, 10-20 cm. wide, abrupdy acuminate, slighdy 

 narrowed at base, the rachis slighdy raised, with flat faces on 

 both sides; pinnae horizontally spreading, linear-lanceolate or 

 broadly linear, the median ones 5-10 cm. long, 8-15 mm. 

 wide, widely decurrent, acutely incurved-toothed in lower por- 

 tion, irregularly and more coarsely so toward the long-acumi- 

 nate tip; fertile pinnae linear, 3-8 cm. long, obtuse, widely de- 

 current. Woods in mountains; Hokkaido, Honshu, Shi- 

 koku, Kyushu; rare southw. s. Kuriles. 



Fam. 16. CYATHEACEAE Hego Ka Treefern Family 



Usually arborescent, with stout erect scaly dictyostelic trunks; fronds mostly large and pinnately decompound; sori dorsal, 

 rounded; indusia globose, opening at the top, partial or wanting; pedicel of sporangium short, of more than three rows of cells. 

 Seven genera, with about 1,000 species, of wide distribution in the tropics and subtropics of both hemispheres. 



l.A. Indusia present; axes not dark and polished; arborescent, with a distinct trunk 1. Cyathea 



IB. Indusia wanting; axes dark and polished; scarcely arborescent, without a distinct trunk 2. Gymnosphacra 



