306 L’ Abbé E. Coémans on the Cladoniz 
the flower is monopetalous, theoretically it is dipetalous, the half 
of it only being present in them; for when, as in the yew, we 
have the whole present, we then find a petal or scale on each 
side, opposed to each other at the base of the disk, which only 
begins to grow after the petals or scales have attained their full 
dimensions. 
It may be that I am wrong in referring the claret-coloured 
crust of petaloid texture which I observed between the scales in 
Wellingtonia to the bract, and that it has not this relation at all, 
and also that cypresses have truly no bract. Should that be so, 
it would furnish a good distinctive character for separating the 
cypresses from the pines. 
I owe some apology to the reader for desiring to give ad- 
ditional explanation on an opinion expressed so recently; but 
in all new lines of thought the mind is at first apt to veer back- 
wards and forwards as new objections or doubts suggest them- 
selves; and although it may not be better for the scientific 
reputation of the thinker, it is certainly better for the progress 
of truth, that these vibrations should be candidly acknowledged, 
so that the real weight of the objections may be estimated by 
fresh and impartial minds. 
XLI.—Notule Lichenologice. No. X. 
By the Rev. W. A. Leicuton, B.A., F.LS. 
CLADONIZ ACHARIANA,. 
Tue Rev. PAbbé Eugéne Coémans, of Gand, Belgium, has re- 
cently published, in the ‘Bulletins de Académie royale de 
Belgique,’ sér. 2. t. xix., the results of an investigation of the 
herbarium of Acharius, so far as regards the Cladonie» The 
herbarium of Acharius is preserved in the Museum of the Uni- 
versity of Helsingfors; and its arrangement is precisely that of 
the latest work of this author, the ‘Synopsis methodica Liche- 
num,’ 1814. The collection comprises 43 genera and about 
980 species, besides innumerable varieties. The localities 
whence the specimens have been gathered are generally noted ; 
but the specimens themselves are often small, and with respect 
to those communicated by others we have no other clue to 
whence they came than the peculiar handwritings of the corre- 
spondents of the illustrious lichenographer. The Cladonie con- 
stitute about a fifteenth part of the collection, and, although not 
the most beautiful portion, is nevertheless exceedingly precious, 
and contains a great number of the types of Flérke, Scherer, 
and Léon Dufour. 
The object proposed in this revision of the Acharian herba- 
