OPHIOGLOSSACE^. 69 



§ I. EUBOTRYCHIUM. Bud enclosed in the base of the stalk. 

 * Leaf rising from above the middle of the stem. 

 t Vernation erect in sterile segment ; steins thickly sheathed 

 with remnants of former years. 



1. B. pumicola Coville, sp. nov. Rootstock vertical, reach- 

 ing a length of 3^' and a diameter of iV, with an abundance of 

 roots a half line or less in diameter ; stem, together with the seg- 

 ments of the frond, reaching a height of 4', the former about 

 twice the height of the latter, and in ordinary specimens i" — 2" 

 in diameter, the lower half or two-thirds thickly sheathed with the 

 dark brown remnants of the stems of previous years ; frond glau- 

 cous, the sterile segment nearly sessile, reaching a length of i', 

 ternate, the divisions nearly sessile, the lateral ones about half or 

 two-thirds the length of the middle one, each pinnately parted 

 into fan shaped somewhat one-sided lobes, these with crenulate 

 margins and usually two to three lobules, the lowermost lobes of 

 the middle division sometimes distinctly pinnatifid into several 

 lobules ; fertile segment in most specimens a little longer than 

 the sterile, bipinnate, or one or both the lowest branches some- 

 times so developed as to indicate a tendency to ternate division ; 

 bud with sterile segment erect, the axes of the lobes horizontal. 



Growing in pumice soil on the summit of Llao Rock, Crater 

 Lake, Oregon, at an elevation of about 9000 ft. {Coville and 

 Applegate, 1898.) 



1 1 Vernation partly inclined in one or both segments. 



2. B. tenebrosum A. A. Eaton. Plant i' — 7' high, averag- 

 ing 2i' — 3', one-third of which is below ground ; slender, fleshy, 

 light green or yellowish after fruiting, transparent when dry; 

 leaf above the middle of the stem, often immediately under the 

 sporophyll, short-petioled, entire, lobed, or usually with i — 3 

 pairs of distant alternate lunate decurrent entire segments ; the 

 apex emarginate or with a triangular elongation ; sporophyll 

 usually short-stalked, simple, or rarely with one or two short, 

 somewhat dilated branches, bearing alternate or nearly opposite 

 clusters of sporanges ; spores very large, verrucose ; sporophyll 

 not bent in vernation. Rich shady situations, usually among 

 maples at the border of swamps ; Massachusetts and New 

 Hampshire to Central New York. 



^ 3. B. lunaria (L.) Swz. MooNWORT. Plant very fleshy, 



