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 



