The Scottish Naturalist. 



125 



careful study, and an intimate acquaintance with specific 

 characters. 



The species which most frequently hybridise are necessarily 

 those whose periods of flowering synchronise, but hybrids also 

 occur between species which do not usually flower at the same 

 time, and these must have arisen from the rare accident of one or 

 other of the parents having flowered at an abnormal period. Such 

 hybrids (of which S. triandra-cinerea Wimm., not yet detected in 

 Britain, is an example) must always be rare. Amongst hybrids 

 which have occurred in Britain, but which have usually escaped 

 recognition, are those between S. cinerea, S. aurita, and S. Caprea. 

 Of these, that between the first two seems to be by no means un- 

 common, but the aurita-Caprea and the cinerea- Caprea hybrids 

 are rarer. From the close relationship of their parents, all of 

 them may readily be passed over. A number of others might be 

 mentioned, but as on this occasion I wish only to call the attention 

 of British Botanists to the necessity for an increased study of the 

 Willows, I abstain from doing so. In conclusion, 1 may add that 

 I shall at all times be glad to examine good specimens. 



KEVISIOtf OF SCOTCH DISCOMYOETES. 

 By Prof. James W. H. Trail, A.M., M.D., F.L.S. 

 HE numerous additions made to the records of the Discomy- 



X. cetes in Scotland since the publication of the Mycologia 

 Scotica in 1879, and the inconvenience of reference to the scattered 

 notices of new discoveries, would have been sufficient to render 

 a revision of this great group from Scotland very desirable as a 

 basis for future investigations. But the need for such a revision 

 has been greatly increased by the appearance of the very important 

 and valuable Manual of British Discomycetes, by William Phillips, 

 F.L.S. I have endeavoured in the subjoined list to give an 

 enumeration of all the Scotch species under the nomenclature 

 adopted by Mr. Phillips, whose book will probably remain the 

 guide to British students of this group for a good many years to 

 come. 



