PlATyCEEiaS). xxiii. 



proximate and sub-confluent in two rows on the contracted 

 upper pinnse ; the receptacles oonsieting of a crowded mass of 

 anastomosed venules. Veins (sterile) : pinnate from a central 

 costa, prominent, the vemules prominent, transversely anasto- 

 mosed, forming nearly equal-sided areoles, within which the 

 vemleis again anastomose, the ultimate areoles including free 

 sterile divaricate veinlets ; or (fertile) : more equally and orowd- 

 edly anastomosing between the primary veins. 



IVonds coriaceous, pinnatifid, and sterile below ; pinnate, 

 contracted and fertile above ; the pinnse sessile, articulated. 

 Erhizome creeping. — ^The netted receptacle of this genus asso- 

 ciates it with Flatijceriv/ms but in habit and aspect the species 

 resemble Drynana. 



Ex, : D. splendens, J. Sm, \ D. pilosum, J. Sm. 



(a) Sori in linear mb-marginal patcTies. 



17. JENKINSIA, Soolcer, Gen. Ml. t. 75. 



NoTHOOHtiENiE sp., WolUcK ; Campii Bp., Freal J Cxbtoqokii sp., J. 

 iSmith ; Lomahiopsidis sp., Mettenius. 



Sori superficial, broadly linear, continuous, sub-marginal ; the 

 receptacles consisting of the (about 3) external series of arcuate 

 venules with their excurrent veinlets : thus compounds Veins 

 pinnate from a central costa, prominent ; venules opposite anas- 

 tomosing in angulate (two-angled) arcs, from the angles of which 

 proceed excurrent veinlets; the veinlets near the margin free in 

 the sterile, often anastomosing in the fertile fronds, the rest free, 

 clavate at the apex ; veins not extending to the margin, 



Pronds pinnate, dimorphous, coriaceo-membranaceous, often 

 proliferous, the fertile contracted. Bhizome decumbent. — This 

 genus is allied to the AcrostichetB through Paedlopteris ; indeed 

 it may be only a dilated condition of this genus with the recep- 

 tacles abnormally areolate. The arcuate soriferous veins also 

 indicate an affinity with Menisciwm; but the compound condition 

 of the receptacles associates it with Platycerimn and Dryo- 

 gtaehymn, in the group Flak/ceriecB — the distinguishing feature 

 of which, consists in the netted receptacles of the confluent 

 masses of spore-cases. 



£x, : J. undulata, Mooh* 



2 



