KEY TO THE FAMILIES AND GENERA 



135 



212. EQUISETACEiE. 



One genus only Equisetum. 



ccc. Indusia inferior, attached under 

 the sorus and opening laterally 

 orbyspUtting radially into lobes. 8. Woodsla, Tribe, 



213. OPHIOGLOSSACE^. 



A. Six>rangia coherent, in 2 ranks, forming 



spikes: veins anastomosing 1. Ophioglos- 



AA. Sporangia free in compound spikes or pani- [sum. 



cles: veins free: Ivs. mostly compound 2. Botrychium. 



214. MARATTIACEiE. 



A. Sori in double lines along the veins, not 



united 1. Angiopteris, 



AA. Sori united in synangia. 



B. Synangia oval, opening by a fissure 2. Marattia. 



BB. Synangia elongate, each compartment open- 

 ing by a terminal pore 3. Dansea. 



215. HYMENOPHYLLACEiE. 



A. Involucre 2-valved 1. Hymeno- 



Iphyllum. 



AA. Involucre tubular or funnel-shaped 2. Trichom- 



[anes. 



216. OSMUNDACE^. 



A. Sporangia borne in panicles formed either 



from certain pinnae or from whole Ivs 1. Osmunda. 



AA. Sporangia borne on the under surface of foli- 

 age Ivs. 



B. Ferns coarse with broad segms 2. Todea. 



BB. Ferns finely cut, membranous 3. Leptopteris. 



217. SCHIZ^ACEiE. 



A. Sporangia borne on under side of normal or 

 altered Ivs. 

 B. Lvs. twining; Ifts. palmate or pinnate: 



sporangia borne singly under scale I. Lygodium. 



BB. Lvs. not twining. 



c. Sporangia in sori on the under surface 2. Mokria. 



cc. Sporangia in 2 ranks forming spikes 3. Sckizaea. 



AA. Sporangia borne in erect panicles formed on 



the elongate lowermost pinnae 4. Anemia. 



218. POLYPODIACE^ffi. 

 /. Summary of Tribes. 



A. Induaium wanting or rudimentary 



(rarely developed in Monogramma). 



B. Sporangium scattered in a stratum 



over the under surface of the lvs.: 



coarse ferns 1. Acrostichum 



BB. Sporangium collected in round or [Tribe. 



linear sori. 

 C. Lvs. not jointed to the rootstock: 

 sporangia in long lines following 



the veins 2. V^ittaria Tribe. 



cc. Lvs. not jointed to the rootstock: 

 sori round. {See Phegopteria in 

 Dryopteria Tribe) 

 ccc. Lvs. jointed to the rootstock: sori 



mostly roundish 3. Polypodium 



AA. Indusium present (exceptionally want- (Tribe. 



ing in Phegopteris, Meniscium, 

 Notholsena and Ceropteris). 

 B. Sori oblong or linear, at least twice 

 a.« long as broad. 

 C. The sori marginal, covered with an 

 indu^'ium formed of the reflexed 

 edge of the If. (naked in Notho- 

 !£ei»a, or naked and distributed 



along the veins in Ceropteris) 4. Pteris Tribe. 



cc. The sori dorsal, covered with a 



flap-like indusium 5. AsPLENitTM Tribe. 



BB. Sori roundish or at least less than 



twice as long as broad. 



c. InduHia superior, attached by a 



central stalk or by a sinus (sori 



naked in Phegopteris and Menis- 



eium). normally dorsal: Ivs. not 



jointed to the rootstock 6. Dryopteri8 



cc. Indusia extrorse or cup-shaped, (Tribe. 



normally marginal: lvs, jointed 

 to the rootstock in most genera . . 7. Davallia Tribe. 



//. Key to (he Tribes, 



1. Acrostichum Tribe. 



A. Sporangia locaUzed on definite areas of the lvs.: 

 Ivs. dimorphous, the sterile basal ones shield- 

 like 1. Platycerium, 



AA. Sporangia covering entire Iva. or entire pinnEe. 



B. Lvs. simple 2. Elapho- 



[glo8sum. 



BB. Lvs. pinnate 3. Acrostichum. 



BBB. Lvs. (sterile), dichotomously forked 4. Rhipidop- 



[tsris, 



2. Vittaria Tribe. 



A. Sori forming 1 or 2 continuous lines parallel 

 to the midrib. 



B. .Sorus 1 or 2 lines 5. MoncH 



[gramma, 



BB. Sorus always 2 fines 6. Vittaria. 



K\. Sori on lateral veins forming more or less 



interrupted lines 7. Antroph- 



[yuTiu 



3. Polypodium Tribe. 



A. Lvs. distinctly dimorphous, compound, the 



sterile basal ones oak-like : plants large 8. Drynarxa. 



AA. Lvs. dimorphous, simple : plants very small.. . . 9. Drymo^ 

 KKK. Lvs. uniform. [glossum, 



B. Foliage covered underneath with stellate 



hairs 10. Cyclophonta, 



BB. Foliage smooth or scaly, not stellate hairy. 



c. Veins free 11. Polypodium, 



cc. Veins anastomosing. 



D. Corresponding veinlets from principal 

 veins uniting and bearing a sorus at 



the end 12. Goniophle- 



DD. Areole bearing 2 or more free veinlets [bium, 



extending outward, which bear a free 



sorus 13. Phlebodium, 



ODD. Areoles containing free veinlets irregu- 

 larly directed 14. Phymatodes, 



4. Pteris Tribe. 



A. Sori dorsal, extending along all the veins, 

 naked. 

 B. Veins copiously anastomosing. 



c. Lvs. large, pinnate 15. Conio- 



[gramma, 



cc. Lvs. smaller, palmate 16. Hemionitis, 



BB. Veins free or only casually uniting. 



c. Lvs. naked 17. A nogramma, 



cc. Lvs. hairy ._ 18. Ceropteris, 



AA. Sori marginal, nominally covered with edge 

 of If. 

 B. The sori at the ends of veins unconnected at 

 their apices, 

 c. Lvs. dimorphous. 



D. Sori at the ends of veins only 19. Crypto- 



[gramTTia, 

 DD. Sori scattered the length of the veins. . .20. Onychium, 

 cc. Lvs. uniform, smooth, on dark-colored 

 stalks. 



D. Veins free: lvs. pinnate 21. PeUsea. 



DD. Veins usually anastomosing: lvs. 



palmate 22. Doryopteria. 



ccc. Lvs. uniform, hairy, scaly or powdery. 



D. Margins scarcely recurved 23. NothoUena. 



DD. Margins recurved to form a distinct 

 indusium. 

 E. Indusia more or less continuous 

 around the segm. 



F. The lvs. pinnately divided 24. Ckeilanthes. 



FF. The lvs. palmately divided 25. Adiantopsia. 



EE. Indusia in the form of more or less 



distant marginal lobes . .26. Ilypolepis. 



BB. The sori inserted beneath the marginal 



indusium: stalks black or blackish 27. Adiantum. 



BBB. The sori rising in a continuous fine-like 

 receptacle which joins the ends of the 

 veins, 

 c. With an inner membranous indusium .... 28. Pteridium. 

 cc. With no inner indusium present. 



D. Lvs. small, radiate-dichotomous 29. Actinopteris. 



DD. Lvs. small, palmate: stalk black 30. Cassebeera, 



DDD. Lvs. larger, pinnate 31. Pieria. 



5. Asplenium Tribe. 



A. Sori parallel to the midrib. 

 B. Sterile lvs. with free veins: sori continuous. 32. Blechnum, 



