42 American Midland Naturalist Monograph No. 7 



1. Botrychium Sw. — Grape Fern 

 1. Sterile blade stalked, attached near the base of the plant; lateral 

 veins of the leaf-segments forked ; epidermal cells with straight 

 walls. 



2. Leaf-segments incised; woods, locally throughout 111 



B. dissectum Spreng. 



2. Leaf-segments merely crenate or serrulate. 



3. Blades thin; segments acutish; woods, locally throughout 111. 



B. obliquum Muhl. 



3. Blades thick, somewhat coriaceous; segments obtuse; woods, 

 rare, n. Ill B. multifidum (S.G.Gmel.) Rupr. 



L Sterile blade nearly or quite sessile, attached near the middle of 

 the plant, thin, membranous, the segments unbranched; epi- 

 dermal cells with flexuous walls; moist woods, common 



B. virginianum (L.) Sw. 



2. Ophioglossum L. — Adders-Tongue 



L Sterile blades usually 2-5, oval, apiculate, the principal veins 13 or 

 more, forming broad areolae containing numerous included 

 veinlets; spores pitted; hillsides, banks, thickets, chiefly on lime- 

 stone, rare; known from Hardin, Jersey, and Randolph counties 

 O. engelmanni Prantl 



I. Sterile blades usually solitary, or sometimes 2, oval, obtuse, the 

 principal veins 7-11, forming narrow areolae containing few in- 

 cluded veinlets; spores reticulate; meadows, open woods, 

 swamps, moist thickets, rare; Jackson and Union counties. [O 

 pusillurn Raf.] O. vulgatum L. 



6. Hymenophyllaceae Gaud. — Filmy Fern Family 



1. Trichomanes L. — Filmy Fern 

 T. boschianum Stunn. On sandstone near a spring, Jackson Hol- 

 low, Pope Co. First collected Aug. 2, 1923, by Mary M. Steagall 37 ; 

 several subsequent collections from near the same locality. 



7. Osmundaceae R.Br. — Royal Fern Family 



1. Osmunda L. 

 L Leaves twice pinnate, some of them fertile at the apex and form- 

 ing an erect terminal panicle; swampy ground or wet woods, 



local. Royal Fern O. regalis L. 



1. Leaves once pinnate. 

 2. Leaves of two kinds, the fertile and sterile ones separate; sterile 

 leaves longer than the fertile, each pinna with a tuft of to- 

 mentum at base; swampy ground; chiefly in the n. part of 

 the state; also Pope Co. Cinnamon Fern O. ciiii^amomea L. 



