414. Rey. W. A. Leighton on the Determination of the 
gida, and approaches C. furcata in the same way as turgida 
approaches to pungens. C. grypea has K—. 
33. C. cenotea, Scher.= Fr. L. 8. 55 {fide spec. a Nyl.); Anzai, 
-C. C. 20; Zwackh. 829; Massal. 156; Scher. L.H.71; Coém. 
Cl. Bele. 116, 117, VES, a1: 
“My herbarium also comprises specimens from Upsal (Dr. W. 
Nylander and Dr. T. M. Fries), Jerkin, Norway (Dr. W. L. 
Lindsay), Untersontheim (Kemler), Mahourat, Pyrenees (Mr. 
Spruce). 
Var. glauca, Flk. = Scher. L. H. 460; Zwackh. 330; Coém. 
Clad. Belg. 111, 112, 118, 114, 115 ; Coém. 1028. 
I have it also from Untersontheim (Kemler). 
34, C. squamosa, Hoffm. (BE. Bot. t. 2862) = M. & N. 645; 
Anzi, C. C. 21, a, ¢; Scher. L. H: 72, 73; 278: Massal: 292, 
A. C.; Mudd, L. Br. 138; Tuck. 30 ; Coém. *1025, 1026, 1027 ; 
Zwackh. 379 ; Mudd, Br. Cl. 40, 41 (part.), 42. 
In my herbarium are also specimens from Upsal (Dr. T. M. 
Fries), Kirjavalaks, Finland (Kullhem), Untersontheim (Kemler), 
Pyrenees (Dr. Deakin), Mount Gaillard, Pyrenees (Mr. Spruce), 
Subat (Dr. Philippe), Bagni di Lucca (Dr. Deakin), Nisay 
(Breutel), Leicestershire (Rev. A. Bloxam), and Shropshire. 
Here is another instance of two different plants being united 
by external characters under the same name, but which are 
readily separated and arranged properly by the hydrate of 
potash. 
Dr. Nylander ( litt.) remarks that the name squamosa, being 
the best-known and the most common one, ought to be defi- 
nitely reserved for that lichen which is the most developed, 7. e. 
that which does not manifest the yellow reaction with the 
hydrate of potash. The lichen, on the contrary, the cortex of 
whose podetia becomes yellow with this reactive (K+), and 
which has frequently the aspect of squamosa, but is much more 
rare, can be nothing more than a variety (uurians or subsqua- 
mosa) of C. delicata, which, by the reaction (K+), shows itself 
to be distinct from sguamosa (K—). 
In the herbarium of Délise, Dr. Nylander has noted with the 
reaction K— the following varieties of his squamosa, viz. tenui- 
uscula, scabrosa, simpler, muricella, crassa, elegans, paschals, 
frondosa, flabellata, rigida, as well as his type of this species. 
The same absence of reaction is visible in his C. cwcullata (which 
scarcely differs from squamosa, var. frondosa, and which Dr. Ny- 
lander says he has, in his Syn. p. 210, incorrectly referred to 
delicata) and speciosa. 
On the other hand, the yellow reaction (K+) is observed in 
C. delicata and its varieties in the herbarium of Délise as well as 
in his C. syrtarum and C, squamosa, var. anomea, Dél. 
