378 THE JOURNAL OF BOTANY 
plant. On the other hand, Schimper’s variety cataractarum differs 
as described in some important characters from our Scotch plant, 
notably in the capsule, which is ovate or subglobose,* while in ours 
it is narrow and elongate, as described above; the leaves are also 
described as softer, chlorophyllose, and (by Boulay) narrow, none of 
which characters are appropriate to our plant. Moreover, specimens 
of the var. cataractarum issued by Schimper himself in his Pugillus 
(Pissevache, Valesiz, leg. Schimper) are entirely different in habit, 
and far nearer W. curvirostris type. I am inclined to suspect it may 
turn out that No. 499, Krypt. Badens, really belongs to the var. now 
under discussion, and is wrongly placed under the var. cataractarum. 
This presupposes that it has only been found in the sterile condition, 
which is certainly the case with the British Museum specimen 
The distant, widely-spreading leaves, almost at right angles to 
the stem, give a characteristic appearance to the var. insignis when 
moist, by which it may be recognized at sight when once known; in 
neither the moist nor the dry condition does it bear much resemblance 
to the ordinary forms of W. curvirostris. The colour also differs 
somewhat from that of most forms of W. curvirostris, is 
usually pale below; in the variety here described the lower part 
of the stems are brown or blackish, and, as mentioned above, not 
encruste 
I have it in my herbarium from the following localities, all 
collected by myself :—Ben Laoigh, c.fr. and sterile; Meall-nan- 
armachan; Acharn Falls; Cam Creagh; Lochay Bridge; Tyndrum 
(all in Perthshire); Glencoe and Ballachulish, Argyleshire ; Inchna- 
damph, Sutherland. 
Dirricuum zonatum Limpr. var. SCABRIFOLIUM, var. Nov. Leaves, 
especially in upper part and frequently to base, scabrous with dense 
conical papilla, frequently on both sides of lamina and at back of 
nerve. 
Has. Near top of Ben Laoigh, Perthshire side, 81 Aug. 1901 
(Sir Jas. Stirling) ; near summit of Ben Lomond (Mrs. Cunninghame 
Graham) ; near summit of Ben Chalum, Perthshire, 20 July, 1898 
(Binstead ¢& Divon). All sterile. 
All the authorities whom I have consulted unite in giving smooth 
cells as a character of Ditrichum Timm (= Leptotrichum Hampe). 
“Folia omnino levia” (Schimper); “ feuilles lisses” (Boulay) ; 
 Blattzellen glatt ’’ (Limpricht) indicate one of the chief characters 
attributed to the genus, and frequently to the whole tribe of Lepto- 
trichace@ ; and I am not aware that any exception has been found 
to the rule among the fifty species enumerated for the genus 
Ditrichum by CG. Miiller (Genera Muscorum). The roughness of 
the subula in D. tenwifolium Lin is due to the nerve and 
to the projecting ends of the cell-walls, not to any true papil- 
losity of the cells of the lamina. The variety now described is 
therefore a specially interesting and striking one, and did the plants 
cited above stand alone, it would have seemed more satisfactory to 
* Schimper gives “* Gymnostomum pomiforme Nees et Hornschuch ex parte” 
as probably a synonym of his var. — ay 
