A HISTORY OF DURHAM 



Hypnum uncinatum, Hedw. Hypnum palustre, L. 



var. plumulosum, Schimp. var. subsphaericarpon, B. & S. 



plumosum, Schimp. eugyrium, Schimp. 



revolvens, Sw. ochraceum, Turn. 



var. Cossoni, Ren, forma falcata, Ren. scorpioides, L. 



commutatum, Hedw. stramineum, Dicks. 



falcatum, Brid. cordifolium, Hedw. 



var. gracilescens, Schimp. giganteum, Schimp. 



incurvatum, Schrad. sarmentosum, Wahl. 



cupressiforme, L. cuspidatum, L. 



var. resupinatum, Schimp. Schreberi, Willd. 



filiforme, Brid. Hylocomium splendens, B. & S. 



ericetorum, B. & S. loreum, B. & S. 



tectorum, Brid. squarrosum, B. & S. 



Patientiae, Ldb. triquetrum, B. & S. 



molluscum, Hedw. rugosum, De Not. 



var. condensatum, Schimp. 



LIVERWORTS (Hepatic*) 



The liverworts (Hepatica?) have received only scant attention com- 

 pared with the mosses, although there is evidence from the plants that 

 have been found that the county is rich in them. The appended list is 

 very incomplete, but is offered as a nucleus for future workers with these 

 interesting and beautiful plants. 



The rare ones are located as follows : Lejeunea serpyllifolia var. 

 cavifolia occurs on the basaltic rock ledges of Falcon Glints, and Lejeunea 

 calcarea forms minute patches on the limestone clints of Ireshope Burn. 

 By the riverside near the High Force grows Porella rivularis. Near 

 the basaltic blocks scattered on the slope of Widdy Bank Fell are 

 Blepbarozia ciliaris and Lepidozia setacea. 



At the base of the High Force is a very rare hepatic, Hygrobiella 

 laxifolia, very scarce in quantity. Of the genus Scapania there are two 

 very rare species not recorded from any other part of England. These are 

 Scapania rosacea, imbedded in the sandy drift by the river side below 

 the High Force, and Scapania subalpina var. undulifolia, in the gravelly 

 detritus by the side of the Weardale road leading into Langdon Beck. 

 Another member, Scapania aequiloba, grows on the Falcon Clints as well 

 as on the slopes of Widdy Bank Fell, but in the latter case usually 

 mixed with mosses, such as Trichostomum tortuosum. The rare Scapania 

 intermedia also grows on the slopes of Widdy Bank, associated with the 

 equally rare Eucalyx obovata. 



By the side of Ireshope Burn we find Chiloscypbus polyantbos, asso- 

 ciated with Jungermania riparia, and on the limestone clints is the minute 

 and delicate Blepbarostoma trie hopby Hum. On Widdy Bank is found 

 Mylia Taylori, which is also of very fine growth on the top of Burnhope 

 Seat, associated with the moss Hypnum jiuitans v&r.falcatum. The variety 

 heterophylla of Plagiochila asplenioides grows by Burnhope Burn, and the 

 variety majus, of yellow colour, by the waterfall at Burtree Ford. 



Plagiocbila spinulosa grows both at the High Force and at Cauldron 



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