949, A NEW MOSS FROM AFGHANISTAN. 
Although 7. media shows a resemblance to certain forms of 
subsessilis is often placed by itself in the genus Pharomitrium, 
characterized by the epg calyptra. The shape of the par Lae 
even if constant, could n e considered a character of su 
generic value; it is, eae n 7’, subsessilis, liable to Slaten 6 
1 have found calyptre tstncly subcucullate, 7. e. deeply split on pe 
side, pee Baie to aria the other side, only one aed short slit. 
separate genus, cae fetes w has been taken by Juratzka 
(Laubmoosfl. von Oes Soa carn, *, 95 Cet who Pech T. sub- 
sessilis, T’. pusilla, and T. lamellata Lindb. in his genus Pterygoneurum, 
and this pm ae has been followed by Limpricht (De Laubm. 
i. Abth. p. 520 (1888 
e2 species Me mentioned above form, with 7’. media and 
T. chottica (Trabut ), a group of five species, all of which show the 
same ais iad leaf-structure. 1’. lamellata, however, is peristomate, 
an er forms so evident a connecting link with other species 
of Tor nae ‘that it seems, I think, far more natural to regard, as many 
authors have done, the peculiar structure of the leaf in these species 
as a character of only secondary generic acon and to give, 
chakohine, Pterygoneurum a sectional or ri¢ rank sg 
Tortula. It may be pointed out that if we consider the peculiar 
a, as wellas 7, odie. oceurs in Afghanistan; there are 
specimens in the eee Herbarium collected by Dr. Aitchison (1884-5), 
no. 186, as well as older ones collected by Griffith, ‘‘ Otipore (Afghan 
Coll.) 93” [1889]. Afghanistan extends the range of distribution 
of T. pusilla, as Persia hag hitherto been recorded as its eastern limit. 
<a XPLANATION OF PuatE 397,—Fig. 1, hg Pter regret media, sp.nov., 
m Afghanistan (Dr. Aitchison, no, 183 in As Ken mee a lants, nat. size. 
2 ae with two capsules x 12. Pgs 
Areolation of leaf as eis saree from fhe bas ~ oe , 7. Areolation 
ot seat at thin trom from the apex.x 255. 8. Transverse a of leaf at 
ex xX 68. ee of same x 255. oe 
seta and vaginula x 12. 11. Calyptra x 25. 2, B 
perigonial Reon ang : 68. 714, Peidine and paraphyses x 68. 
(Note to Fig. 8.—A slight error appears in this igo of the draw 
of the nerve-section. The four small cells, shown with shaded walls, in ee 
centre of the nerve are the “ Begleit meee an the cell-walls of this group 
should be represented as very thin and delicate 
© 
