134 THE JOURNAL OF BOTANY 



the habitat affected by T. subulata var. subinermis Wils., and when 

 later on Dr. Kidston kindly sent me a specimen of the original 

 gathering *, it proved to be, as I had anticipated, this marked sub- 

 aquatic variety of T. subulata, and in noway resembled the T. inermis 

 sent me by Dr. Braithwaite. Later, on the occasion of a visit to 

 Dr. Braithwaite in 1911, I asked to see the specimen : he showed me 

 his sheet of T. inermis, which contained one packet only, from the 

 South of Europe ; this appeared identical with the specimen he had 

 sent to me, and I have no doubt that the latter was actually taken 

 from this South European specimen. I asked him if he could show 

 me the actual Scottish plant, and he said it must have been mislaid, 

 and he should no doubt come upon it later. 



There can be no doubt, I think, that Dr. Braithwaite had, by a 

 confusion of names, taken the Stirlingshire plant for the S. European 

 T. inermis, had mounted this South European plant for comparison — 

 as was his custom, it being a good fruiting specimen — on his sheet of 

 T. inermis, and then had supposed, when he sent me the specimen as 

 also when he described and figured it in the Suppl. to Vol. iii. of Brit. 

 Moss Flora, that he was dealing with the Stirlingshire plant. 



Tortula inermis must certainly be erased from our list of British 

 mosses. 



Didymodon ripabius (Aust.) Kindb. 



Among the specimens above referred to from the herbarium of the 

 late Wm. West was one labelled " Hydrogonium Warnstorfii. In 

 R. Bann at Lisburn, Co. Down, July 1902; J. H. Da vies ; in herb. 

 Wm. West, comm. Braithwaite." 



This is a short-leaved form of Dicliod ont ium pell ucidum . Tricho- 

 stomum (Ilydroaonium) Warnstorfii Limpr. is a plant of somewhat 

 similar habit, but with {inter alia) much smaller cells ; it occurs on 

 water-worn rocks about the Rheinfalls and in one or two other 

 localities in Switzerland. The European plant, however, has been 

 identified with Hyophila riparia Aust., and the correct naming of 

 the species appears to be as given in the heading to this note. The 

 determination of this Irish plant, as Dichodontium pellucidum, may 

 perhaps prevent future misunderstanding. Didymodon riparius is 

 not very likely to occur in Great Britain or Ireland. 



DlSCELTUM NUDUM Brid. 



Among some mosses collected by Mr. D. A. Boyd in Scotland was 

 a minute one which I recognized as the <$ plant of this rare species. 

 It was collected on a clay bank at Kilwinning, Ayrshire, in Sept. 1913; 

 the very minute stems were remarkable for the dense agglomeration 

 of antheridia they contained, giving the capitula a quite distinct 

 reddish colour when viewed with the lens. This would appear to be 

 abnormal, as Wilson an*d Limpricht describe the <$ flowers as bearing 

 few antheridia. 



* The labelling was " Tortula inermis Brid. On trees covered with mud from 

 recurring overflow of stream — near Cowio Moss — near Stirling. Coll. Stirling 

 and 11. Kidston." 



