— 96 — 
The William Mitten Lichen Herbarium. — We quote the following from 
the Journal of the New York Botanical Garden , March, 1918: “The lichen her- 
barium of the late William Mitten, presented to the Garden several years ago 
by his daughter, Miss Flora Mitten, is being incorporated in the general her- 
barium of the Garden. This collection contains many fine specimens, most 
of which are- determined.'’ 
Claassen on Lichens of Northern Ohio. — Edo Claassen published a list 
of the lichens of northern Ohio in the Ohio Naturalist , June, 1912, and has re- 
cently published an additional list 9 of 23 species found in one or more of seven 
counties centering around Cleveland. Species noted as apparently quite rare 
are: Arthopyrenia macrospora, A. quingueseptata, Bilimbia trachona, Lecanora 
tar tar ea, Lecidea myriocarpoides, and L. pycnocarpa. 
O. E. J. 
The Stirling Herbarium. — It is stated in Nature that the herbarium of 
the late Lord Justice Stirling has been presented by Lady Stirling to the Tun- 
bridge Wells Natural History Society, England. The collection is said to con- 
tain “about 6,000 varieties of mosses and liverworts.” 
More Lichens for Nantucket. — In two former lists 10 R. Heber Howe, Jr., 
enumerated the lichens found on the island of Nantucket, and in a third list * 11 
he enumerates seven more species, making altogether for the island 34 species. 
EXCHANGE DEPARTMENT 
Offerings — To members only. Return postage should accompany the re- 
quest; a stamp is better than a stamped envelope, as specimen packets do not 
always fit the latter. 
Mr. C. C. Plitt, 3933 Lowndes Ave., Baltimore, Md. — Cladina implexa 
Harm., collected in England by Rev. P. G. M. Rhodes, and Solorina crocea (L.) 
Ach., from Colorado. 
Mr. S. Rapp, Sanford, Florida. — Sphagnum recurvum Beauv. and S. strictum 
Sulliv., collected in Florida by Mr. Rapp. 
9 Claassen, Edo. Second Alphabetical List of the Lichens Collected in Several Counties 
of Northern Ohio. Ohio Journ. Sci. 18 : 62-63. December, 1917. 
10 Howe, R. Heber, Jr. Rhodora 14 : 88-90. 1912, and 15 : 93-94. 1913. 
11 Howe, R. Heber, Jr. Rhodora 20: 40. Feb., 1918. 
