The lichens of the Linnean Herbarium with remarks on 
-Acharian material 
R. HEBER Howe, Jr. 
Through the kindness of Dr. B. Daydon Jackson, general 
secretary of the Linnean Society of London, I had the opportunity 
from February 12 to 20, 1912, to study the lichens (314 sheets, 
fide Jackson) of the Linnean Herbarium now preserved in Bur- 
lington House, London, England. 
I have made a critical study only of those species which now 
fall under the family Usneaceae (plus p. Filamentosi of Linn.), but 
am listing here all species that can in any sense be considered 
represented by types. In 1886 Dr. E. Wainio examined the 
herbarium and published a list of the species (Revisio Lich. in 
herb. Linn, asservatorum. Meddel. Soc. pro Fauna et Flora 
Fenn. 14:I-Io. 1886). He made no attempt, however, to select 
types, and I have found a number of important sheets he failed 
to record, e. g., L. nivalis: 3 specimens. Moreover, he did not 
have the great advantage of Dr. Jackson’s* exhaustive study of the 
Linnean Herbarium, Linneana, and the handwritings of con- 
temporaneous botanists. Dr. Wainio’s determinations and mine 
(in the Usneaceae) agree in the main, and where we differ I have 
had the kind aid and collaboration of Miss Annie Lorrain Smith, 
of the British Museum of Natural History, e. g., “1 folio... 
A. chalybeiformis Wain.” = A. jubata. 
__ The sheets referring to Species Plantarum (1753) fall naturally 
ito four classes. First, those that have the Sp. Plant. number; 
the €quivalent name in Linnaeus’ handwriting; plus the number of 
his Fl. Suec. (1745). These specimens (in the Usneaceae) repre- 
Sent reliable types, based evidently on Dillenius’ Historia Mus- 
hes (1741) and diagnostically described by Linnaeus in Sp. 
~int., with correct references to Dillenius’ figures, e. g., L. floridus. 
* 
Jackson, . ¥ 3 : 
ey MS. list Linn. Herb. 1755?, I-39 [1907]; e Proc. Linn. Soc. 89-126. 
T Crombie, Jour. Linn. 17: 554-556. 1880. 
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