88 Rhodora [May 
enumerated or with Carex rupestris All., Saxifraga nivalis L., Dryas 
integrifolia Vahl, Pedicularis flammea L., Campanula uniflora L., and 
other arctic-alpine types. In the mountains of Colorado also this 
glabrous plant ascends to high altitudes, reaching 2500 m., and 
thence it extends northward to northern British Columbia. As a 
geographic variety it is well marked and it should be called VrorA 
RENIFOLIA Gray, var. Brainerdii (Greene) n. comb. 
GRAY HERBARIUM. 
SOME LICHENS FROM NANTUCKET ISLAND, MASSA- 
CHUSETTS. 
R. Heser Howe, JR. 
Mn. EvcENE P. BICKNELL on a collecting trip to the islands of Nan- 
tucket and Tuckernuck, Massachusetts, last June (1911), was kind 
enough at my request to gather for me a considerable number of 
lichens. Though Mr. Bicknell had never collected lichens before, 
the collection he made contains beside the more common species a 
number of lichens decidedly worth recording. 
It is not improbable that some lichenist in the past has collected at 
Nantucket, but beside a few specimens in my own herbarium collected 
by non-botanical friends, and a plant or two found in the Alexander 
W. Wheelock herbarium, I have never seen any specimens from these 
islands in the large museum herbaria I have from time to time ex- 
amined. Dr. Riddle writes me, however, that he has noted Nantucket 
material in various herbaria. It was nevertheless on account of its 
scarcity that I ventured to ask Mr. Bicknell to gather what specimens 
he could for me,— and to him I am gratefully indebted. 
The lichen flora as exhibited by this collection shows an interesting 
mixture of littoral and Austral species whose presence it is not diffi- 
cult to explain by the climatic conditions governing the islands. A 
few curious northern species are noted. 
The plants listed here are now to be found in the author’s herbarium; 
duplicates of a few were sent to Dr. L. W. Riddle and Dr. Ludwig 
Scriba for their collaborative opinions. 
