Ophioglossaceae 



29 



gins somewhat whitish, the nerves slender, parallel in lower 

 half, the veinlets anastomosing; peduncle of fertile blade on 

 the upper side of frond near the middle, arcuate, rather stout, 

 thickened above, simple or once forked, 1-4 cm. long; fertile 

 spikes linear, straight, slighdy flattened, with a deep groove 

 on each side, 5-10 cm. long, 5-6 mm. wide, obtuse with a 



small blackish mucro at apex. Tree trunks; Kyushu (Yaku- 



shima); rather rare. Ryukyus, Formosa, Philippines, Mal- 

 aysia to India, Polynesia, and Australia. 



2. Ophioglossum thermale Komar. O. vulgatum var. 

 thermak (Komar.) C. Chr.; O. littorale Makino; O. nipponi- 



cum var. littorale (Makino) Nishida ex Ohwi Hama-hana- 



YASURi. Stipes 7-20 cm. long; sterile blade broadly linear to 

 oblong or navicular, 1-3 (-5) cm. long, 0.3-1 cm. wide, obtuse 

 to acute at apex, narrowly cuneate at base, sessile or indistinctly 

 short-petiolate; venation fine, with small oblong areoles and 

 a few secondary free veinlets. Apr.-Dec. Wet sandy sea- 

 shores; Hokkaido, Honshu, Shikoku, Kyushu. Formosa 



and Kamchatka. 



Var. nipponicum (Miyabe & Kudo) Nishida. O. nipponi- 

 ctim Miyabe & Kudo; O. japonicum Prand, non Thunb.; O. 



angtistatum Maxon; 0. savatieri Nakai Ko-hana-yasuri. 



Sterile blade thinner, usually oblong, sometimes elliptic, more 

 often lanceolate, 2.5-6 cm. long, 1-2 cm. wide, distinctly short- 



petiolate. Sunny ground in inland areas; Hokkaido, Hon- 

 shu, Shikoku, Kyushu. Korea and China. 



3. Ophioglossum petiolatum Hook. Fuji-hana-yasuri. 

 Stipes 8-20(-30) cm. long; sterile blade ovate to broadly so, or 

 oblong, 1.5-6 cm. long, 1-3 cm. wide, usually distinctly petio- 



late; areoles rather large, without intermediate veinlets. 



Apr.-Nov. Hokkaido, Honshu, Shikoku, Kyushu. Tropical 



Asia, Korea, Ryukyus, Formosa, Bonins, Hawaii, Micronesia, 

 and tropical America. 



4. Ophioglossum vulgatum L. Hiroha-hana-yasuri. 

 Stipes 15-30 cm. long; sterile blade fleshy and softly herba- 

 ceous, ovate to deltoid-ovate, rarely oblong, 6-12 cm. long, 3-7 

 cm. wide, usually sessile, with a cordate to sometimes truncate 

 base embracing the base of peduncle of the sporophyll, the 

 venation with oblong areoles and sometimes with secondary 



areoles and numerous secondary connecting veinlets. Apr.- 



July. Hokkaido, Honshu, Shikoku, Kyushu. Widely dis- 

 tributed in the temperate areas of the N. Hemisphere. 



5. Ophioglossum kawamiuae Tagawa. Sakurajima- 

 HANA-YASURi. Small somewhat tufted herb with short erect 

 rhizomes; sterile blade wholly suppressed; fertile spike broadly 

 linear, 3-10 mm. long, cuspidate; peduncle slightly thickened 

 at apex, green. July-Aug. Kyushu (Sakurajima) ; rare. 



2. BOTRYCfflUM Sw. Hana-warabi Zoku 



Rhizomes short, erect or ascending, with rather fleshy roots; sterile blade sessile or petiolate, pinnately or ternately divided, 

 the segments toothed, with free veins; fertile blades 1-3 times pinnately divided; ultimate branchlets with 2 rows of naked 

 sporangia; sporangia free, rather coriaceous, globose, mostly sessile, without an annulus, opening transversely into 2 valves. 

 A cosmopolitan genus with about 30 or more species. 



lA. Small glabrous herbs, usually not more than 20 cm. high, of alpine regions; sterile blade simply pinnate or ternate, not more than 

 8 cm. long. 

 2A. Sterile blades oblong to ovate, simply pinnate to ternate, the pinnae oblong, obovate, or flabellate, obtuse. 



3A. Sterile blade sessile or nearly so, pinnate, inserted at or above the middle of the stipe, the pinnae 7-11 I. B. lunana 



3B. Sterile blade petiolate, insened near the top of the stipe; pinnae fewer 2. B. simplex var. tcnebrosum 



2B. Sterile blades deltoid, sessile, the lowest pair of pinnae largest, the blade apparently ternately divided, the pinnae lanceolate, acute. 



3. B. lanccolatum 

 IB. Larger herbs more or less hairy on the buds, usually 15-60 cm. high or more, of mountains and lowlands; sterile blade ternate, the 

 segments 2-pinnate or ternately 2-pinnate, 3-30 cm. long. 

 4A. Sterile blade petiolate, usually evergreen. 



5A. Segments of the sterile blade obtuse, the ultimate segments mucronate- to crenate-toothcd. 



6,\. Fertile stalk without a sterile frond or scale of the previous year at base; sterile segments scarcely to very slightly white- 

 margined t. B. ternattim 



6B. Fertile stalk with a sterile frond or white membranous scale of previous year at base; sterile segments more or less white- 

 margined. 



7A. Plant 15-30 cm. high; sterile blade 3- or 4-ternate, 5-10 cm. long, 6-12 cm. wide 5. B. robustum 



7B. Plant 8-13 cm. high; sterile blade 2- or rarely 3-ternate, 2.5-4 cm. long, 3-5 cm. wide 6- B. multifidum 



5B. Segments of the sterile blade acute, the ultimate segments mucronate- to aristulate-toothed. 



%.\. Sterile blade aristulate-toothed; lowest posterior lobe of the pinnules of sterile blade flabellate-orbicular, dccurrent on the rachis 



of the main segment beyond the base of the pinnules 7. B. japonicum 



8B. Sterile blade mucronate-toothed ; lowest posterior lobe of the pinnules of sterile blade obliquely cuneate and sometimes only 



slightly decurrent, not entirely so on the rachis of the main segment 8. B. nipponicum 



4B. Sterile blade sessile, deciduous. 



9A. Fertile panicle once pinnate, linear or cylindric, scarcely broadened at base, scarcely or not overtopping the sterile blade; pinnae 



with an accessory lobe on the posterior side below the insertion of the pinnae 9. B. strictum 



9B. Fenile panicle compound, pyramidal, broadened at base, longer than and overtopping the sterile blade; pinnae without an acces- 

 sory lobe on the posterior side below the insertion of the pinnae 10. B. virginianum 



1. Botrychium lunaria (L.) Sw. Osmunda lunaria L. wide, sessile or nearly so; pinnae 7-11, flabellate, reniform, or 



HiME-HANA-WARABi. Glabrous rather fleshy herb 5-25 broadly cuneate, 7-13 mm. long, 5-15 mm. wide, truncate to 



cm. high; stipe solitary, covered widi brown inembranous cuneate and entire on lower margin, crenulate or rarely incised 



slightiy fibrous sheaths at base; sterile blade at or above the on upper margin, palmately veined, short-petiolulate; fertile 



middle of the stipe, simply pinnate, 3-6 cm. long, 1.2-2.2 cm. spike 1.5-6 cm. long, on a peduncle twice as long. July- 



