320 ON THE HIERACIA OF NORTH YORKSHIRE. 
together, under cultivation, attentively, will, I am convinced, 
always lead to a right conclusion). In P. angulare, although 
the direction of the pinnula is towards the apex of the pinna in 
a slight degree, it is far less so than in P. aculeatum, and it 
always has a greater tendency to bulge on its posterior* mar- 
gin, giving it the semblance of falling back towards the axil of 
the pinna, as shown in the diagram. The pinne are also more 
nearly opposite in this species, and nearly at a right angle with 
the rachis at c. 
P. angulare-—Fronds evergreen, prostrate through the winter, 
decaying at the base, always in its fullest development producing 
the variety subtripinnatum. Rare in the north of England, show- 
ing its tendency to be tender. Spores biverrucose; primary 
verruce very coarse in comparison with P. aculeatum. 

On the Hieracia of North Yorkshire and Teesdale. By Joun 
G. Baker. 
(Continued from page 231.) 
5. H. murorum, Linn. Spec. Pl. 1128, pro parte; Fries, Symb. 
109.—Stem one to two feet high, rigid or flexuose, usually with 
a single leaf, slightly hairy below, corymbose above. Petioles 
shaggy. Root-leaves numerous, densely rosulate, green upon the 
upper surface, occasionally tinged with purple, paler beneath : 
outer rounded, obtuse ; inner large, ovate-lanceolate, with several 
acute teeth below the middle, the lower of which are pointed down- 
wards. Peduncles arcuate-ascending, like the ovate-based mvo- 
lucres clothed with white stellate down and black hairs and séte. 
Heads numerous. Phyllaries dark green, paler at the margins ; 
outer acute, inner acuminate. lLigules commonly glabrous. 
Styles more or less livid. 
Rocks and walls, not infrequent both amongst the oolitic and 
carboniferous ranges of moorlands, but not so common as the 
next-mentioned species, in juxtaposition with which it often 
grows. On the west of the central valley in Teesdale, the ordi- 
nary place of these is in a great measure filled by H. pallidum. 
* Posterior with reference to the pinna. 
