BOTANY 



the granite and clay slate. A comparatively small portion of the county has 

 been explored for mosses, but the neighbourhood of Bodmin, in the eastern 

 half, has been thoroughly examined by Mr. R. V. Tellam, who pub- 

 lished a list of species in the "Transactions of the Penzance Natural History 

 Society, new ser. ii. 354 (1887-8), and the neighbourhood of Mount 

 Edgcumbe, Saltash, and Torpoint, on the Cornish side of the Tamar, by 

 Messrs. F. Brent and E. M. Holmes, whose records are given in vol. iii. 

 of the Annual Reports and Transactions of the Plymouth Institution and 

 Devon and Cornwall Natural History Society. The country around 

 Penzance was carefully searched for many years by Mr. W. Curnow 

 and Dr. Ralfs, and latterly by Mr. E. D. Marquand. A list of the 

 species found by these botanists was given in the Transactions of the 

 Penzance Natural History and Antiquarian Society, new ser. i. 117, 422, 

 including a few others found by Messrs. E. M. Holmes, W. Mitten 

 and W. B. Waterfall. Still later a few have been added by Mr. H. N. 

 Dixon. 



Dixon and Jameson's Handbook of British Mosses has been followed 

 throughout in the lists here given, with the exception of the Sphagnacece, 

 for which Horrell, The European Sphagnacea (after Warnstorf) has been 

 utilized. The rarer species met with in the county are indicated by 

 an asterisk preceding the name, and the very common species, 93 

 in number exclusive of varieties that occur in most counties, are 

 not given in this list. The mosses characteristic of high moorland or 

 subalpine districts are naturally fewer in number than in Devonshire, 

 where the great extent of Dartmoor offers better conditions for their 

 growth than the limited and somewhat warmer Bodmin Moors, which 

 form its counterpart in Cornwall. 



Of the rarer species Campylopus introjlexus is usually found on 

 granite near the sea ; Tortula canescens on sunny, rocky declivities ; Philo- 

 notis rigida in deep sheltered spots or glens. Hookeria late-wrens has been 

 found nowhere else in Great Britain, and very sparingly in Ireland. 

 Eurhynchium strigosum for many years was known to occur only near 

 Truro in this country, and the locality has not been refound. Ditrichum 

 subulatum occurs very sparingly near Truro and Saltash, and in a few 

 spots in Devonshire on the opposite side of the Tamar, where it reaches 

 apparently its northern limit. Fissidens serrulatus is a very rare Euro- 

 pean species and has not been found north of Cornwall, where only 

 the male plant has been detected as yet. F. polyphyllus is also very 

 rare, but has been found in Devon, north Wales, and Ireland. Epipte- 

 rygium Tozeri seems to occur more abundantly on a yellowish clay-slate, 

 which also Tortula cuneifolia, Schistostega osmundacea and Ditrichum subula- 

 tum seem to prefer, but it is rarely found in fruit. 



Species preceded by a note of interrogation, although recorded by 

 other botanists, have not been seen by the writer, who cannot guarantee 

 their correctness. The rarest species are marked by an asterisk. 



75 



