48 



OPHIOGLOSSACEAE (ADDER'S TONGUE FAMILY^ 



distinct, rather coriaceous, not reticulated, globular, without a ring, and open. 

 ing transversely into two valves. Sterile segment of the frond ternately oj 

 pinnately divided or compound ; veins all free. Spores copious, sulphur-color. 

 (Name a diminutive of ^^rpvs, a cluster of grapes, from the appearance of the 

 /ructification.) 



§ 1. EUBOTRYCHIUM Milde. Base of the stalk (containing the bnd) completely 

 closed; sterile segment more or less fleshy ; the cells of the epidermis straight. 



* SterUe segment sessile or on a short petiole (less than 1 cm. long). 



1. B. Lunaria (L.) Sw. Very fleshy (8-18 cm. high) ; sterile segment sub- 



sessilCf borne near the middle of the plant, oblong., simp7y pinnate xoith 5-15 



lunate or fan-shaped very obtuse crenate, incised, or nearly entire, 



J fleshy divisions, more or less excised at the base on the lower or 



^ on both sides, the vei^is radiating from the base and repeatedly 



forking; fertile segment panicled, 2-3-pinnate. — Open places, 



e. Que. to Vt., n. O., L. Superior, and north w. ; rare. (Widely 



distr.) Fig. 1. Also on wooded cliffs near Syracuse. N. Y., where 



tending to a more slender form with decidedly stipitate sterile 



segmt-nt and subremote more narrowly cuneate 



pinnae (B. onondagense Underw.). 



2. B. simplex E. Hitchcock. Fronds small 

 (5-10 or rarely 25 cm. high) ; sterile segment 

 short-petioled from near base, middle, or sum- 

 mit of the stalk, thickish, simple, and roundish, 

 or pinnately 3-7-lobed ; the lobes roundish- 

 obovate, nearly entire, decurrent on the broad 

 and flat indeterminate rhachis, the terminal 

 one usually emarginate ; the veins all forking 

 from the base; fertile segment simple or 1-2- 

 pinnate. (B. tenebrosum A. A. Eaton.) — N. S. 

 to Md., Ont., Minn., and Rocky Mts. ; rare. 

 (Eu.) Fig. 2. Var. compositum Lasch. Sterile 2. B. simplex, 

 segment binate or ternate ; the divisions pin- 

 natifid. — Occurring with and cjearly passing into the typical form 



3. B. lanceolatum (Gmel.) Angstroem, var. angus- 

 tisegmentum Pease & Moore. Fronds small (1-2.5 « 

 dm. high) ; the sterile segment closely sessile at the ^^ 



'** top of the long and slender stalk, scarcely fleshy, 



triangular, ternately ticice pinnatifid; the acute lobes lanceolate, 

 incised or toothed; veinlets forking from a continuous midvein; 

 fertile part 2-3-pmnate. — N. S. to N. J., O., and L. Superior. 

 July, Aug. Fig. 3. The typical European 

 form has the segments of the sterile frond 

 broader and more approximate. 



4. B. rambsum (Roth) Ascliers. Fronds 

 a^^<£p J ^^ small (1-2.5 dm. high); the sterile segment 

 %. ^L'T, efn M M^ nearly sessile at the top of the long and 

 slender common stalky moderately fleshy, 

 ovate or triangular, varying from pinnate to 

 bipinnatifid ; the lobes oblong-ovate and 

 obtuse ; midvein dissipated into forking 

 veinlets ; fertile part 2-3-pinnate. (B. ma- 

 tricariaefolium A. Br.; B. neglectnm Wood.) 

 — Rich soil, e. Que. to Md., and west\,. 

 June, July. (Eurasia.) Fig. 4. 



• * The sterile segment on a long petiole (2-16 cm. in length). 



5. B. obliquum Muhl. Subcoriaceous (1-4 dm. high), sparsely 

 hairy or glabrous ; sterile segment long-petioled, springing from 

 near the base of the plant, broadly triangular or somewhat pen- 



