308 L’Abbé E. Coémans on the Cladoniz 
C. cariosa. Dy. Nylander refers it to C. delicata, Fik. (Ny). 
Syn. p. 211). 
In the herbarium of Flérke, preserved in the museum of 
Rostock, there are a great number of specimens of C. cariosa 
with sterile and macrophylline thalli, perfectly similar to the 
C. strepsilis b. plumosa of the Acharian herbarium. He has 
therefore confounded two neighbouring forms, but belonging to 
two different types. 
The C. strepsilis (Ach.) represents only an insignificant form 
of C. cespititia, and may therefore be neglected in lichenography. 
As to the variety plumosa, it may be mentioned as a sterile form 
of C. cariosa, without elevating it to the rank of a variety. 
5. Cladonia alcicornis, (Ach.) Syn. p. 250 et hb. ejusd. 
Under this name many different species are preserved in the 
Acharian herbarium :— 
(1.) Divers specimens of the true C. alcicornis, collected in 
France, Germany, and Switzerland. There is no specimen from 
Sweden, notwithstanding that this species grows in the Scandi- 
nayian peninsula, even to the 6Oth degree of latitude. I have 
found it abundantly this summer, especially on the west side of 
Sweden. 
(2.) Two specimens of C. cervicornis received from Germany. 
This error of determination is very easily explained by the diffi- 
culty which very often exists of distinguishing with certainty 
the thallus of C. cervicornis from certain sterile forms of C. alct- 
cornis which have the inferior surface of their leaflets rose- 
coloured or purplish. 
(3.) Hight tufts of C. pungens, Fk. This error seems almost in- 
explicable ; but the examination of the herbarium of the celebrated 
Swedish lichenographer has proved to me that, to the end of 
his life, he never rightly knew the C. pungens, and that the re- 
proach which Flérke formerly addressed to him, that he did not 
know the Cladonie well, was sometimes not without foundation. 
Lastly, amongst the specimens of C. alcicornis in fructification 
there is a specimen of C. degenerans, and another of C. pyxidata, 
fertile. Could it be through carelessness that Acharius placed 
here these lichens? 
The C. gentilis, (Ach.) L. U. p. 580, which Acharius at first 
made a variety of C. alcicornis, but which he withdrew in his 
‘Synopsis,’ in consequence of the criticisms of Flérke, most 
certainly belongs to C. alcicornis. It constitutes, according to 
the two small specimens in the herbarium at Helsingfors, a form 
or even a variety with simple narrow leaflets having long black 
fibrille on their margins. The aspect of this variety reminds us 
of that of Physcia leucomela, Mich. 
