A HISTORY OF DERBYSHIRE Then there are 36 species which are found only on the grit, and four occurring on both grit and sand. These limitations are indicated in the list appended. With regard to the occurrence or otherwise of mosses in the county some remarks seem to be called for. The Andrecece are all rare ; apparently they require the proximity of high mountains in order to flourish well. No Buxbaumia has as yet been discovered, whilst the genus Seligeria is well represented, all but one being found. The list of Dicrana is poor, and though the genus contains species inhabiting all altitudes, there are but few to be found in Derbyshire. The Rbacomitria again are not so plentiful as might be expected. As regards the Ortbotrichacece, tree mosses are very and inexplicably scarce in the county ; few of any interest are recorded except about Matlock. Neither are there many members of the orders Leucodontacete and Leskeaceae to be found. Very little of the surface level being over 2,000 feet there is an absence of alpine species as a rule, and the county being far from the sea maritime mosses are also mostly not in evidence. The absence of certain species (if really absent) is not easy to understand, such e.g. as Bartramia ithyphylla, Grimmia orbicularis, Brachythecium salebrosum. The following is the list of mosses for the county ; the Sphagna, which are arranged on the Warnstorfian system, are not assigned to any particular formation, though as far as I know none have been recorded from the limestone : Sphagnum fimbriatum, Wils. Girgensohnii, Russ. rubellum, Wils. var. pallescens, W. - acutifolium, Ehrh. quinquefarium, Warnst. subnitens, Russ. & Warnst. var. pallescens, Warnst. versicolor, Warnst. violascens, Warnst. virescens, Warnst. molle, Sulliv. var. tenerum, Braith. squarrosum, Pers. var. spectabile, Russ. teres, Angstr. var. imbricatum, Warnst. cuspidatum, Russ & Warnst. var. submersum, Schimp. recurvum, Russ. & Warnst. var. amphyphyllum, Warnst. mucronatum, Warnst. parvifblium, Warnst. molluscum, Bruch. compactum, DC. var. squarrosum, Russ. subsquarrosum, Warnst. subsecundum, Limpr. inundatum, Warnst. rufescens, Warnst. crassicladum, Warnst. turfaceum, Warnst. Sphagnum cymbifolium, Warnst. var. glaucescens, Warnst. pallescens, Warnst. papillosum, Lindb. var. normale, Warnst. sublaeve, Limpr. Andreaea petrophila, Ehrh. Grit crassinervia, Bruch. Grit Tetraphis pellucida, Hedw. Browniana, Grev. Grit Catharinea undulata, Web. & Mohr. crispa, James. Grit Oligotrichum incurvum, Lindb. Grit Polytrichum nanum, Neck. aloides, Hedw. urnigerum, Linn. alpinum, Linn. Grit piliferum, Schreb. juniperinum, Willd. strictum, Banks. Bogs on grit gracile, Dicks. Grit formosum, Hedw. commune, Linn. Diphyscium foliosum, Mohr. Grit Archidium alternifolium, Schimp. Pleuridium axillare, Lindb. subulatum, Rabenh. alternifolium, Rabenh. Ditrichum tenuifblium, Lindb. 46
