244 LICHENES HIMALAYENSES. 
Has. Binsur, alt. 7500 feet; on oaks. May. (Coll. n. 23 dis.) 
A very different species from any Usnea with which I am acquainted, 
but probably allied to U. dichotoma, Fries, Syst. Orb. Veg. p. 282, 
from Nepal. The similarity to Alectoria sarmentosa, Ach., is very 
great, from which lichen the central thread at once distinguishes it. 
Main stems diverging from a central point, eight to twelve inches 
long, occasionally beset with short horizontal fibres: ultimate fibres 
and branches often more or less rufous, The apothecia are very few, 
and so imperfect, that they had better be called cephalodia: they show 
an inclination to the fibrillose margin which is found in other species 
of the genus. This lichen is accompanied by Parmelia leucomela and 
P. varia? 
4. Evernia Sfracheii, Bab.; thallo ochroleuco cartilagineo rigido subla- 
cunoso compresso subcanaliculato nitidiuseulo ramoso, ramis subline- 
aribus irregulariter palmatis et laciniatis, apicibus plus minus trun- 
catis bi- seu tri-fidis, marginibus denticulos ramulosque corallinoideos 
nigro-terminatos passim proferentibus, pagina inferiore versus basin 
subsanguinolento, apotheciis . 
Has. Gori River, Kumaon, (on the ground?) among moss and 
dead leaves; alt. 4700 feet. Pindari, Kumaon, mixed with roots; 
alt. 12,000' feet. Bompras Garhwal, with Cetraria ambigua, Bab.; 
alt. 16,000 feet. (Coll. n. 41.) 
Allied to Æ. prunastri, Ach., with which it agrees in the mode of ra- 
mification (though our lichen is more irregular), and in the inner texture 
of the thallus ; but the upper surface of Æ. Stracheii is far less lacunose 
and more rigid above, and very differently coloured below. Parmelia 
(Hvernia) denudata, Hampe (in Linnæa, 1843, p. 121), appears from 
_ the description to have some points in common with our plant, but 
.. it can hardly be the same species. 
5. Ramalina farinacea? Ach. ——— 
Has. Barren fragments, from Chinar, Kumaon, alt. 8700 feet; and 
from Gori River, Kumaon. 
.6. Cetraria ambigua, Bab.; thallo foliaceo depresso submembranaceo 
ochroleuco laciniato, laciniis linearibus lobatis apice bi- seu tri-fidis 
subeoncavis marginibus nigro-denticulatis, pagina superiore levi (non 
lacunosa), inferiore corrugata pallida nuda, apotheciis . . . 
.. Ha». Bompras, Garhwál, growing on wood and over roots, alt. 16,000 
feet; barren. (Coll. n. 6.) i 
