OPHIOGLOSSACEJE 



by a transverse slit. The spores are developed from the main tissue 

 of the fruiting stem, and the prothaUus is underground. 



1. BOTRtCHIUM. MooNwoRT. 

 Fleshy plants from a short, erect rootstock. The 

 sterile portion ter-nately or pinnately compound ; the 

 fertile portion pinnately divided, with sessile sepa- 

 rate sporangia in rows on the sides of the branches ; 

 spores yellow. 



1. B. virginUnum, (L.) Sw. Rattlesnake Febn. 

 Sterile portion sessile, attached above the middle of 



the plant, the main divisions on short' stalks, 1 or 2- 

 pinnate, and the leaflets pinnatifid; fertile part 2 or 3- 

 pinnate. Cool rich woods, Man.-Alta. 



2. B. Lun&ria, (L.) Sw. 



Pjq 4 3q_ The sterile part of the frond almost sessile, l^innate, 



trychiu m the divisions entire and somewhat fan-shaped, very 

 Lunaria. succulent. Foothills of Rocky Mts. 



-^. 



Fig. 5. — Equisetum arvense. 



sterile shoot; /, fertile shoot showing the spike at a; b, sporophyll, with spo- 

 rangia; 9, apore. 



