Subkingdom PTERIDOPHYTA. 



Order I. PILIOALES. 



Vernation erect or inclined; sporanges in spikes or panicles, opening by a 

 transverse slit. Fam. 1. Ophioglossaceae. 



Vernation coiled; sporanges reticulated, with annulus (rudimentary in 

 Fam. 2). 

 Sporanges opening vertically. 



Sporanges panicled, with rudimentary ring; marsh ferns. 



Fam. 2. Osmundaceae. 

 Sporanges ovoid, in panicles or spikes, with a vertical ring. 



Fam. 3. Schizaeaceae. 

 Sporanges opening transversely, provided with a vertical ring, borne in 

 sori on the back or margin of the leaf. Fam. 4. Polypodiaceae. 



Family 1. OPHIOGLOSSACEAE Pi esl. Adder's Tongue Family. 



Veins reticulate ; sporanges cohering in a distichous spike. 1. Ophioglossum. 

 Veins free ; sporanges distinct, borne in spikes or panicles. 2. Botrychium. 



1. OPHIOGLOSSUM L. Adder's Tongue. 



Leaves ovate to elliptic, large; basal veins 9-13 or more. 1. 0. vulgatum. 

 Leaf lanceolate, small ; basal veins 5-7. 2. 0. arenarium. 



1. Ophioglossum vulgatum L. Common Adder's Tongue. M. p. 2. Bogs 



and pastures. Sunmier. 



£wc^s— Woodbourue (Cr), Durham, Ruth (Fr.), Solebury Twp. (Ws.). 

 Delaware— lHayeTfoTd (C. E. S.), N. W. part of the county, Dr. Geo. 

 Smith (Pu.). Chester— (F.). Lancaster— Fulton Tyvp. (Pr.). Berks— 

 Hamburg (Br.) (Cr.) (Ke.). 



Burlington — Medford (Br.), Brown Mills, Hanover (C). Salem — 

 Riddleton, Middlesex, Woodbridge (C). 



New Castle — Brandywine, Tatnall; Dixons, Commons; Iron Hill, Canhy. 



2, Ophioglossum arenarium E. G. Britton. M. p. 2. Sandy soil. Sum- 



mer. 

 Cape May— Near Wild wood. 



2. BOTRYCHIUM Sw. Moonwort. 



Bud for the following year enclosed in the base of the stem. 



Leaf rising above the middle of the stem, small plants maturing in 

 early summer. 1. B. matricariaefolium. 



Leaf rising from little above rootstock. 



Vernation wholly straight; bud smooth; leaf entire or 2-6-lobe<l. 



2. B. simplex. 

 Vernation inclined; bud pilose; leaf ample, ternate. 



Leaf segments obliquely ovate or oblong ; large, 1-2 cm. long. 



3. B. obliqwum. 

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