256 Field Notes. 
Clematis vitalba, does not grow anywhere in the wood, which 
disposes of any probability of the moth having been introduced 
by artificial means.—L. S. Brapy, Sheffield, June 11th, 1907. 
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MOLLUSCA. 
Clausilia bidentata m. dextrorsum in Lincs.—On April 
18th Mr. Vernon Howard, M.A., visited Haugham Pasture, an 
old wood on the lower chalk near Louth, and there collected 
mollusca ; amongst those he kindly submitted to me was a 
good example of Claustlia bidentata m. dextrorsum.—C. S. 
CarRTER, Louth. 
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FLOWERING PLANTS. 
The Butterfly Orchis in East Yorkshire.—Habenaria 
bifolia, a plant rarely found in the East Riding, at least on or 
east of the Wolds, has been discoverd in a fine patch near 
Tibthorpe, Driffield (see remarks in ‘Flora E. R. Yorks.’)— 
(Miss) L. F. Piercy, Tibthorpe, June 13th, 1907. 
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MOSSES. 
Luminosity of Schistostega osmundacea.—A short time 
ago the luminosity of this plant was alluded to in the ‘Naturalist.’ 
As is well known, the spores of mosses produce a branched 
filamentous protonema on germination. The cells of this 
protonema (which contain chloroplasts) are of remarkable form, 
convex above and conical below. The light which enters these 
cells is first refracted and then reflected from the sides of the 
cone in such a way as to go across the conical parts of the 
cells, where it is again reflected from the sides, and on emerging 
into the air is again refracted. In this way some of the light 
which enters the cells leaves them again in the direction of the 
observer. As this moss always grows in cave-like places, it 
gets but a moderate amount of light for photosynthesis, and 
there is no doubt but that the peculiar morphological character 
of its protonemal cells is an ecological adaptation. I first saw 
this moss twenty-nine years ago in a cavernous place about 
three miles west of Buxton, and I shall never forget the strange 
sight.—Wwm. West, Bradford. 
Inglebro’ Mosses.—Hypnum giganteum Schp. This! moss 
grows in considerable quantity in the rills joining the Fell Beck 
just above Gaping Gyll. This is a new locality for, A: 
giganteum, which is rare in West Yorks. Wor 
Naturalist, 
