LICHENES HIMALAYENSES. 245 
Allied to C. sepincola, Ach., from which it differs in colour, though 
there is a slight inclination to become olive at the extremities ; and 
also to C. nivalis, but the thallus is more membranaceous and spread- 
ing, and not lacunose above, as in that species. In decay it becomes 
brown below, with a very slight tinge of purple, as it appears. Pro- 
bably this may be the same species as Fries alludes to at page 40 of 
the * Lichenographia Europæa : his plant is also barren. 
7. Cetraria Stracheii, Bab.; thallo amplissimo patulo coriaceo sub- 
lacunoso nitido glauco deinde sublutescente, lobis amplis rotundatis 
fertilibus digitatis, subtus pallidiore demum (in senectute) fulvescente 
rugis elevatis confertissimis sinuosissimis reticulato, ad interstitia 
_et dorsa rugarum passim sorediis minutis cyphelliformibus niveis 
-guttato, passim fibrilloso, fibrillis albidis rigidis, apotheciis posticis 
ad margines loborum sitis confertis demum omnium maximis, disco 
castaneo corrugato margine thallode irregulari cincto. 
Has. Katki, Kumaon, alt. 7200 feet; on bark. (Coll. n. 11.) 
The most splendid species of the genus, and one of the most distinct. 
In the magnitude and colour of the thallus, and in the size, position, 
and colour of the apothecia, it immediately reminds us of Nephroma 
polare; but it is a true Cetraria, and perhaps more nearly allied to 
C. glauca than to any described species. Thallus 6-8 inches broad, 
forming irregular patches spreading over bark and sticks, rigid; a 
single lobe is sometimes 3 inches broad; lobes rounded, waved and 
scalloped, margined by the neat brown apothecia, at first very minute 
and thick-set, but at length becoming almost 4 of an inch broad, and 
giving the main lobes a digitated appearance ; the base of the apothecia 
is semi-lunate, and extends at both extremities of the lune considerably 
beyond the lobe of the barren thallus, so that the latter presents a con- 
stricted appearance above at the part to which the disc is adnate, as is 
the case in N. polare, though in a less remarkable degree. Thallodal - 
margin sometimes very narrow and even evanescent ; at other times or 
on other parts of the same apothecium leafy and lobed, and bearing 
young apothecia on the lobes. Medullary stratum pure white. Under - 
surface variable in colour, whitish, dirty yellow, brownish, and in decay - 
inelined to be fulvous ; for the most part naked, but in places furnished 
with dirty-white branched fibres or bristles ; the wrinkles are very much 
raised, sinuous and anastomosing, giving the under surface a reticulated 
appearance (cf. Nephroma cellulosum, Ach.). In some of the interstices 
