Page:VCH Surrey 1.djvu/91

BOTANY N.; R. affints, Wh. & N.; with forms of R. imbricatus, Hort; R. eryf&rinus, Genev. ; and R. incurvatus, Bab., are fairly frequent and locally abundant. CRYPTOGAMEjE VASCULARES LYCOPODIACEJE Three species of this order are found in the county. Of these the peat-loving clubmoss (L. inundatum) is the commonest. It has been found in all of the districts except Medway, and is particularly abundant on the heaths and moors of the western part of Surrey. The common clubmoss (L. clavatum) occurs in about six of the districts, and is de- cidedly uncommon, while the fir clubmoss (L. Selago) is rare. It has been found in about half of the districts, but it occurs very sparingly where I have seen it. The following is a list of the species : Lycopodium clavatum, L. L. inundatum, L. L. Selago, L. EQUISETACE^E Eleven species of horsetail are found in Great Britain, and of these Surrey possesses seven, of which one is of special interest. Of the others Eq. arvense and Eq. limosum are very common, Eq. maximum and Eqs palustre considerably less so. The wood horsetail (Eq. sylvaticum) occurt in about half of the districts but is not common ; it may be seen in grea- beauty and profusion on the railway banks between Witley and Hasle, mere, and in some of the adjoining woods. The Dutch rush is very rare, having been found in only two districts. The remaining species, Eq. titora/e, has been briefly referred to before. It grows in plenty on the curious sand-covered bog on Bisley Common, and in one or two peaty places close at hand. This plant, by many regarded as a hybrid (Eg. arvense and limosum) , is not known to occur elsewhere in Britain. It is sparsely scattered over a considerable part of Europe and is also found in North America. The following is a list of the species : Equisetum maximum, Lam. Equisetum litorale, Kuhl. arvense, L. limosum, L. sylvaticum, L. hyemale, L. palustre, L. MARSILEACE^ The pillwort (Pilularia globulifera), the only species of this order found in Britain, is a curious little creeping herb with erect, rush-like leaves 3-4 inches long, at the base of which are found the round capsules from which the plant derives its name. It is not very uncommon about margins of ponds, but is easily overlooked. It grows in a number of localities extending over five or six of the districts. i 49 B