CHAPTER XXI. 
PTERIDOIDES. 
Ceterach officinapum Willd. Native. Xerophilous. 
Area 7. Range 250. In Wensleydale upon a wall in 
Mr. Willan's yard at Appersett, Moore. Sought for there 
recently without success by Mr. Wheldon. Gathered lately 
in the lower part of Wensleydale by Mr. W. Robinson and 
Mr. Percival. 
Woodsia ilvensis R. Br. Incognit. This species has 
been met with in Teesdale on the Durham side of the river, 
and is said to have been gathered by the late Mr. Potter, the 
fern collector, on Cronkley scars. 
Polypodium vulgape L. Native. Area general. Range 
0-800. Common upon rocks and trees, ascending to the Main 
Limestone of Micklefell. 
P. Phegoptepis L. Native. Montane. Area 987432. 
Range 0-550. Frequent in damp woods amongst the hills 
upon both sides of the Central Valley, ascending to Cronkley 
scars and the Main Limestone cliffs of Punchard's gill. In 
the Central Vale on Buttercrambe moor. 
P. Dpyoptepis L. Native. Montane. Area 9875432. 
Range 0-700. In similar situations to the preceding, and 
equally frequent, but not known in the vales. I have seen it 
clearly within the Upper zone upon the slope of Micklefell 
towards Lunedale. 
P. Robeptianum Hoffm. Native. English type. Xero- 
philous. Area 9 7. Range 400. In Teesdale on the scars of 
Cronkley fell, W. H. Brown. In the Yore district on the scar 
above Carperby, /. Percival ; and of Gayle beck, F. A . Lees. 
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