YORKSHIRE NATURALISTS UNION AT ROKEBY. 213 
growing principally on poplar, willow, and walnut trees, and 
was a desideratum for Britain. It had, however, been gathered by 
Wilson near York in 1856, and a description is given in Braithwaite’s 
British Moss Flora, part 12, and figured in the same work, table lv. 
figure a. No definite locality is mentioned for it in Yorkshire. 
Mr. Barnes was fortunate to meet with a few tufts of it growing on 
an ash tree, amongst Leucodon marl near Abbey Bridge, which 
now records it distinctly as a North shire moss. e plant is 
dicecious, and, as far as I am aware, ay not been found with fruit in 
Britain ; the few tufts gathered were all without fruit. It is, however, 
easily hcbanioed by its broad obtuse leaves, ‘slightly hyaline, and 
minutely serrulate at the point,’ etc. It should be carefully looked 
for upon tree trunks in moist shady places, and from its habit of so 
tarely fruiting it has possibly been passed over by bryologists. 
A concise description of the moss is given also in Hobkirk’s Synopsis 
of the British Mosses. 2nd edition, p. 135 
The bryologists on Monday confined themselves mostly to the 
exploration of Thorsgill, near Barnard Castle, as it was within the 
most convenient distance for the limited time at their disposal. 
Mr. Barnes had come up to Darlington on the previous Saturday and 
had been able to search over a greater portion of the district, and it is 
through his exertions that we are enabled to give so satisfactory a list 
of mosses seen, many amongst them being rare, although previously 
recorded. 
In August 1879, I explored the Greta from its junction with the 
Tees near Rokeby to some distance up the stream, to determine the 
Hepatic of the district, and I add a list gathered at that time :— 
Hepatics. 
Frullania dilatata — abundantly Diplophyllum albicans L. 
e bark o Ju ngermania riparia pare common 
Lejeunea tain ta Lib. in damp places, with fru 
cin Tite, anne L., fruiting very Jungermania ventricosa Dicks. 
Jungermania turbinata Raddi, very 
Hecate platyphylla Be plentiful on wet stones and 
Porella rivularis Nees. dripping rocks, fruiting ne tL 
Lepidozia reptans L, Nardia emarginata Ehrh., comm 
Lepidozia setacea Lin Pellia epiphylla L., common in aie 
Lophocolea cuspidata pee places. 
Kantia trichomanis L. Metzgeria pubescens Raddi, growing 
Blepharostoma tricophylla Dumort., abundantly on the limestone scars 
fruiting very abundantly. near Rokeby, always sterile. 
The plants in the above list are mostly of general distribution ; the 
locality more especially in the fine shady glen near Rokeby has the 
Moisture and shelter where this tribe flourish best. If the district 
plied well investigated by some resident bryologist, who could 
ef T2o2 
