490 MR. E. S. SALMON: REVISION 
plants of the Kew specimen there is one showing two sete 
coming from the same perichetium. In the leaf, capsule, and 
peristome there is no difference, and there seem, therefore, no 
characters to separate S. asiatica from S. helicophylla. ln 1892 
Bescherelle (8) gave a fuller description of his species, but only 
the same characters, quoted above, are given as separating it 
from S. helicophylla. 
S. breviseta, Lindb. MS. in herb. (non Wils.), is nothing but 
a form of S. helicophylla with very short sete. Exactly similar 
states may be found mixed with normal plants of S. Aelico- 
phylla in the same tuft, as may be seen in the Desierto Viejo 
specimens (M. Bourgeau) in the Kew Herbarium. 
S. HELICOPHYLLA, vat. MICROTHECA. 
There is a moss in the Kew Herbarium, from Tihri-Garhwal, 
N.W. Himalaya (J. F. Duthie, 1893), named S. microtheca, 
C. Müll, but I cannot fiud any published description of this 
name. The specimen is identical with some small forms of 
* Leptotrichum himalayanum, Mitt." in the Kew Herbarium, 
and differs from typical S. helicophylla only in the smaller size, 
leaves with almost or quite entire margin, and nerve faintly rough, 
or smooth at back, elliptic-oblong capsule on a shorter seta, 
and little branched stems (Pl. 25. figs. 17-23). Such plants are 
somewhat intermediate between S. helicophylla and the var. tenuis 
described below, and it would be convenient to retain microtheca 
as a varietal name for these Indian forms, although there are 
certainly intermediates connecting them with the type. 
S. HELICOPHYLLA, var. TENUIS. 
S. tenuis, Schimp. MS. in Herb. . 
S. caulibus erectis brevibus (2-6 mm.) simplicibus ; foliis mino" 
ribus 3-4 mm. longis, marginibus integerrimis vel apice minute 
serrulatis, nervo lævi vel dorso ad apicem minute scabro, thecis in 
pedunculo longo (1 em.) erectis parvulis ellipticis oblongisve, 
sporis minoribus. 
This is a well-marked variety. The very short unbranched 
stems, slender sete (often over a centimetre long), short leaves, 
and small capsules give it a very distinct appearance (Pl. 25. 
figs.-3-16). The spores are about 12 p in diam., and are slightly 
