Howe: LICHENS oF THE LINNEAN HERBARIUM 203 
At Burlington House I had also the opportunity to study a set 
of specimens which though probably not cotypes (perhaps in some 
cases topotypes) represent authentic Acharian material. These 
were mentioned by Dr. Asa Gray (Sill. Amer. Jour. Sci. and Arts 
' 40: 8. 1841) as follows: ‘Here we find the cryptogamic collec- 
tions of Acharius, containing the authentic specimens described 
in his works on the Lichens, ....” On examining these I find 
them named by Acharius but without localities, and I therefore 
conclude that the specimens at Helsingfors (Universitetets 
Botaniska Institution, fide Dr. Fred. Elfving im litt.) where the 
localities (type) are given must constitute the true types. In 
De Candolle’s work (La Phytographie 391. 1880) we find the 
following: “Acharius, Herb. de l’'Univ. d’Helsingfors (Laséque, 
Mus. Deless. 344 [1845]). Une série authent. de ses esp. dans 
herb. de la Soc. Linn. de Londres (A. Gray, Amer. Journ., Oct. 
1840)." Through the kindness of Dr. Jackson, and with the 
permission of the Council of the Linnean Society I am able to 
throw the following light on the acquisition of this material by 
the society. 
“Copy of Minutes of Linnean Society of London relating to the 
Lichens presented by E. Acharius 
SASS Snr hasheeceutusensdoens: 
— to Dr. Acharius, F.M.L.S., upon his sending to the 
ety a Collection of specimens of lichens describ* by him. 
of ere that a Cabinet be provided to contain the Collection 
t ichens presented to the Society by Professor Acharius: but 
ae greater expence be incurr’d on this Account than Five 
s. 
General Minutes, 7th March 1 809. 
dus a ection of Lichens from Sweden, describ’d in the Metho- 
“Council Min cre Presented from Dr. Acharius, F.M.LS. 
minutes, 17th November 1812 
sented gad omy of the Society’s Transactions be pre- 
THorEay Museum or 
Concorp, Mass. 
NATURAL History, 
