Artificial Synopsis of Genera. 65 



ORDER OPHIOGLOSSACE/E. 



Vascular Cryptogamia with fronds usually from a fleshy, some- 

 times bulbous root, straight or inclined in vernation. Sporangia 

 formed of the interior tisslie ofthe frond, spiked or panicled, 

 naked, not reticulated, destitute of a ring, opening by a transverse 

 slit into two valves discharging copious sulphur-colored spores. 

 Prothallium (so far as known) subterranean, not green, monoe- 

 cious. 



XXX. Ophioglossum, L. Sporangia cohering in one or more 

 simple spikes. Veins reticulated. 



XXXI. Botrychium, Swz. Sporangia in pinnate or compound 

 spikes or panicles. Veins free. 



ARTIFICIAL SYNOPSIS OF THE GENERA. 



Sporangia collected in sori and borne on the back 



or margin of a leafy frond, . . ... B. 



] Sporangia in spikes or panicles not on the leafy 

 I portion of the frond, ... . . T. 



A. \ 



( Sori covered with indusia, C. 



1 Sori naked, ... . P. 



Fertile frond closely rolled together, entirely un- 

 like the sterile, its segments berry-like or neck- 

 lace-like XXII. 



Sori marginal, covered with a reflexed portion of 



the frond D. 



Sori marginal or terminal borne on an elongated 

 receptacle, . . ... . .... XXV. 



Sori dorsal or marginal, provided with special in- 

 dusia, ... .... H. 



D. 



t Terrestrial, growing mostly in rocky places, . . E. 



1, Aquatic, sterile fronds floating on the water, . . XI. 



' Sporangia at the ends of the veins, borne on a re- 

 flexed portion of the margin of the frond, . . VI. 

 Sporangia borne on a continuous, marginal, vein- 

 E. J like receptacle connecting the apices of the 



veins .... VII. 



-Sporangia at or near the ends of unconnected 

 veins, borne on the under surface of the frond, F. 



—1(1 



