18 THE JOURNAL OF BOTANY 



nearly eight miles north-east of the Marlborough Greywethers. 

 Grimmia subsquarrosa and Ulota Hutcliinsicd are additions to the 

 Wiltshire sarsen stone moss flora ; they, like a number of the 

 species recorded by Mr. Dixon in his paper on the Marlborough 

 Greywethers, are siliceous rock-loving species very much out of 

 place on chalk downs, and their localities on the highly siliceous 

 sarsen stones near Marlborough and Aldbourne are outlying 

 stations. According to the Ceiisus Catalogue, the nearest 

 stations for Grimmia subsquarrosa are in the counties of Hereford 

 and Worcester, w^hile to gather Ulota HutchinsicB one would have 

 to go as far afield as Carmarthen and Devon. Both mosses are 

 recorded from Cornw^all, and Mr. Dixon considers that the spores 

 of these aberrant sarsen stone species were in all probability " in 

 most cases carried by westerly winds from the granite rocks of 

 the Cornish peninsula in comparatively recent times." 



Savernake Forest is not so remarkable for rare species as for 

 certain mosses which, generally rare in fruit, are found in that 

 condition within its boundaries ; by the side of a gravel path in 

 the north-eastern part of the Forest, Brachythecium i^umm fruits 

 freely for a considerable distance, and with or near it grow 

 Brachythecium illecebrum, Hypnum Schreberi, Hylocomium 

 splende7is, and Hylocomium squarrosum, all with capsules, while 

 Zygoclo7i viridissimus, Neckera pumila, N. complanata, Pterogo7iium 

 gracile, Eurhynchium Siuartzii, and E. immilum are also mosses 

 that I have found fruiting w4thin this sylvan tract. Philofioiis 

 calcarea var. laxa, growing by the sides of the Kennet and Avon 

 Canal between Great Bedwyn and Hungerford, is a new variety. 

 Other features in the list are Leptodon Smithii on a beech in the 

 Grand Avenue, Savernake Forest (this fills up a gap in the distri- 

 bution of this species) ; the flowering Philonotis ccEspitosa, in two 

 bogs near Great Bedwyn ; and the occurrence of interesting forms 

 of Webera aniiotina and Hypnum riparium at Dod's Down Brick- 

 works and W^ilton Water. 



The nomenclature and arrangement of the Census Catalogue 

 have been followed. I have included in the list those species in 

 Mr. Dixon's paper already mentioned, which are new vice-county 

 records for v.-c. 7. The number or numbers appended to each 

 moss indicates the vice-county or vice-counties in which it has 

 been observed. I have to acknowledge much kind help and 

 notes from Messrs. H. N. Dixon, H. H. Knight, and W. E. 

 Sherrin. The list contains over eighty Wiltshire new county records- 

 and shows how proliflc a small area may be, if carefully examined. 



7 — North Wiltshire. 8 = South Wiltshire, c.fr. = With 

 fruit. ■'' — New vice-county record. 



Polytrichum nanum Neck. 8. Sparingly on London Clay at. 

 Dod's Down Brickworks, near Great Bedwyn. 



P. aloides Hedw. 7", 8. Savernake Forest ; on London 

 Clay at Dod's Down Brickworks, near Great Bedwyn. 



P. urnigerum L. 7", 8. Plentifully in the north-eastern part 



