t62 The Itisk Naturalist, August, 



efforts to determine it, I submitted specimens to Mr. H. N. 

 Dixon, F,IyS., who, with his accustomed kindness, examined 

 the plant, which he had no hesitation in referring to the 

 present species, a continental moss hitherto unknown as 

 British. He writes : — u This is a very interesting plant. It is 

 Ditrichum vaginalis (Sull.) Hampe., and is distinguished from 

 D. homomallum, var. zonatum [ = D. zonahim, Brid.] by the 

 shorter adpressed leaves with recurved margins and stouter 

 nerve." Dr. Braithwaite, F.L.S., to whom Mr. Dixon for- 

 warded examples, verifies the identification, and the plant will 

 be described and figured by him in a supplement to the con- 

 cluding volume of his British Moss Flora, which, in an 

 interesting letter, he informs me is now nearing an end. As it 

 will likely be some time before that appears, it may be well that 

 I should append a synonymy and a translation of L,impricht's 

 description (Laubmoosc, vol. i., p. 500.) When Dr. Braithwaite 

 reaches his supplement he will, no doubt, give a fuller 

 description, with needful comparisons and elucidations, in his 



usual manner. 



Ditrichum vaginans (Sull.) Hampe. 



Syn.—Trichostomum vaginalis, Sulliv. Muse. Alleghan. No. 176. (1846). 



Lcptotrichum homomallum, var. (3. striclum, Scliimp. Syn., ed. I., p. 144^ 



(i860). 



Leptotrichum avimonlanum, Scliiiup. in Schedulis. 



Didymodon tenuis, Sendt. uach Milfle, Bryol. Sil., p. 135. 



Aongstromia Lamyi, Boul. Muse, de l'Est, p. 553. (1872). 



Leptotrichum vaginalis, Schimp. Syu., ed. 2, No. 140. (1876), excl. var. (3. 



Ditrichum lineare (Sw.) Liudb. in Sched. 



Descr.— Dioicous : in dense yellow-green tufts. Plauts erect, filiform, 

 with very slender erect shoots. Leaves erect, appressed when dry, 

 from a longish ovate concave base, gradually pointed, channelled 

 towards the point, margin entire, revolute in upper half, nerve 

 strong, ending in the point. Cells smooth, elongated and rectangular 

 below, more quadrate above. Capsule erect, cylindric, light brown ; 

 lid conical; peristome teeth of two filiform legs, yellow, feebly 

 papillose. 



Hab. — Sandy clay (not on limestone) in the mountains. 



Distr. — France, Rhine provinces, Westphalia, Vosges, Ardennes, 

 Pyrenees, Bavaria, &c. 



Recent addition— Ireland (Colin Mountain, Co. Antrim, 1901). 



To the two well-known British bryologists whose names have 



been mentioned I have to acknowledge my great indebtedness. 



Iyisburn- 



