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Yorkshire Naturalists at Thornton Dale. 
On Monday an investigation was made of the Ellerburn marsh and 
of the area round the calcareous springs at the lower end of Sand -dale. 
The marsh yielded the spinulose buckler fern, saw-wort with quite 
simple leaves, and the meadow thistle ( Cirsium britannicum Scop.) 
Round the springs the black bog rush was abundant, and Dr. Pearsall 
confirmed a previous record of Scirpus multicaulis , recorded previously 
in only one locality in Baker’s ‘ North Yorkshire.’ 
Among other interesting plants found were mountain catsfoot and 
the purple mountain vetch. 
Hepatics (F. E. Milsom).- — -The hot weather which preceded Whit- 
week was not conducive to the finding of hepatics, everything being very 
much dried up. However, in the moister places, several interesting 
species were obtained . 
Near Saltersgate Anthoceros punctatus was found growing with 
Blasia pusilla. Interesting, too, was the large quantity of Aneura 
pinguis in fine fruit growing amongst Hypnum commutatum in the stream- 
lets near Whitecliff Rigg. 
Other hepatics gathered are as follows : — 
Conocephalum conicum. 
Marchantia polymorpha. 
Pellia epiphylla. 
Metzgeria furcata. 
Alicularia scalaris. 
Gymnocolea inf lata. 
Lophozia ventricosa. 
L. porphyroleuca. 
Plagiochila asplenioides. 
Chiloscyphus polyanthus . 
Lophocolea bidentata. 
L. cuspidata. 
Cephalozia bicuspidata. 
Calypogeia trichomanis . 
Lepidozia rep tans. 
Diplophyllum albicans. 
Scop aria dent at a. 
S. undulata. 
S. irrigua. 
Frullania Tamarisci. 
Lichens (W. E. L. Wattam). — An examination of many of the walls 
and trees within the precincts of the village, despite their dusty coverings 
showed that when more congenial conditions for lichen growth returned, 
a charming colour scheme would greet the eye. The walls would appear 
to be chiefly comprised of the local rocks, for particulars of which Elgee’s 
‘ The Moorlands of North-east Yorks.’ pp. 192-195 should be consulted.. 
The species noted on the walls and trees were : — 
Pannaria rubiginosa Del. in Dub. 
Parmelia perlata Ach. P . saxatilis Ach. 
P. conspersa Ach. P. fuliginosa Nel. 
Xanthoria parietina Th. Fr. 
X. stellaris Nyl. and var. leptalea Nyl. (on old apple tree). 
Squamaria saxicola Poll. 
Placodium callopisr^um Maeg. P. sympageum Ach. 
Callopisma vitellinum Sydow. C. expixantha Nyl (on tree boles );„ 
Lecanora gal actina , Ach. L. dissipata Nyl. L. dispersa Nyl. 
L. crenul at a Nyl. L. varia Ach. 
L. atra Ach. L. parella Ach. 
Pertus aria communis D.C. L. symmicata Ach (on old palings). 
Lecidia contigua Fr. (stones stream side). 
Mycoblastus sanguinaria Ach. 
Bilimbia sabuletorum Branth et Rostr. (on dead moss wall tops). 
Verrucaria margacear'Wahl. (stones in stream). V. muralis Ach. 
The beech and ash woods on the way to Ellerburn, the churchyard’ 
wall at Ellerburn, the trees and walls beyond the fish pond, and the 
calcareous flushes to the east of the valley yielded the following ad- 
ditional species : — 
Collema pulposum Ach. Amongst the calcareous debris of the water 
flushes . 
Leptogium scotinum Fr. On the calcareous covered rocks in the streams 
branching from the water flushes, and also on Char a hispida in 
the lesser water runnels. 
Naturalist 
