72 PERNS : BRITISH AND TOREIOW. 



Sub-Order IV. — Osmundacea, 

 Ring apical, often rudimentary only. 



Tribe I. Schizas». — Sporangia produced on contracted racemes, 

 or on terminal or marginal spike-like appendices, ring 

 complete. 

 II. Osmundese. — Sporangia globose. Ming rudimentary 

 only. 

 2. E.tannulatsB. — Sporangia coriaceous, destitute of a ring. 



Oeder II. — MarailiacecB. 

 Fronds circinate. Sporangia dorsal, free, or connate, opaque, 

 coriaceous. 



Order III. — Opliioglosnaceie. 

 Vernation straight, the fronds rising from a root-stock, consisting 

 of a fascicle (more or less according to age) of fleshy roots. Sporangia 

 homogeueous, connate on spikes, or free and paniculate. 



Order IV. — Lycopodiacem. 



Plants with indefinite prolonging, erect or pendulo\is, stems 

 furnished with acerose rusciform, or jungermania-like leaves (some- 

 times very small), bearing 1-3-celled sporangia in their axes, or 

 on catkin;like spikes. 



Order V. — Marsileacece. 



' Plants floating or growing in water, consisting of grass or trefoil- 

 like leaves, or branched with imbricate leaves, bearing 1-3, or 

 irtany-colled sporangia at their base or otherwise (see the characters 

 of the respective genera). 



