72 FEENS : BRITISH AND FOREIGN. 



Sub-Order IV.— Osmundacea. 

 Ring apical, often rudimentary only. 



Tribe I, SchizEese, — Sporangia produced on contracted racemes, 

 or on terminal or marginal spike-like appendices, ring 

 complete. 

 II, Osmundece. — Sporangia globose. Ring rudimentary 

 only. 

 2. Exannulatje. — Sporangia coriaceous, destitute of a ring. 



Order II. — Mamttiaccce. 

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

 coriaceous. 



Ordsr III. — Ophioglossacea. 



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

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

 homogeneous, connate on spikes, or free and paniculate. 



Order IV. — Lycopodiacea. 



Tlants with indefinite prolonging, erect or pendulous, 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. — Marsihaccce. 



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

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

 mmy-cclled sporangia at their base or otherwise (see the characters 

 of the respective genera). 



