FEBRUARY. 



43 



resemblance to one sometimes to the other, so that they get refeired to 

 either. The point which distinguishes the Cheilantkece is the puncti- 

 form receptacle, and this seldom fails ; while the common continuous 



§10. Pteride-e : Pteris repandula. 



indusium which in some cases covers several of these punctiform sori, 

 from its similarity to Pteris, often misleads. The group comprises five 

 genera : Adiantopsis, Cheilanthes, Hypolepis, and Cassebeera, with sori 

 terminal on the veins, the latter genus having them more within the 

 margin than the rest ; and Plecosorus, with sori medial on the veins, 

 placed towards the centre of the lobes. 



The Pteridece are separated from the foregoing by having their 

 receptacles linear, continuous and marginal, that is, transverse to the 

 veins. They comprise eight genera, namely : — Onychium, Ochropteris, 

 Haplopteris, and Pteris, with free veins ; Campteria, with combined 

 transverse-costal veins ; and Loncltitis, Litobrochia, and Amphiblestra, 

 in which the veins are reticulated, — in the last compound-reticulated. 



The third group (c), with the receptacles arcuately-transverse on 

 the venules, falls into this place, on account of its sori, though short 

 compared with most of the preceding groups, and curved, being yet 

 parallel in its general direction with the midrib and margin. It gives 

 rise to two sections, as follows : — 



(c). Receptacles short, arcuately transverse, costal or medial — 



Sori indusiate §11. Woodwardiew. 



Sori non-indusiate |l2. Menisciece. 



?ll. WoodwardiEjE : Woodwardia radicans. 



