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The nomenclature of the genus Usnea 
R. HEBER HoweE, Jr. 
(WITH PLATES 9-14) 
In my first paper on the genus Usnea (Bull. Torrey Club 36: 
309-327. pl. 21-23. 1909) I made no attempt to solve the 
nomenclatural questions presented in this genus. In my second 
paper (Bull. Torrey Club 37: 1-18. pl. 7-7. 1910) I located the 
types of the species concerned and attempted to use determinations 
made of the Dillenian types by Crombie to elucidate the problem 
of the Linnean species. In a still later paper (Bull. Torrey Club 
37: 605-609. 1910) I made further notes based on Dr. Wainio’s 
report on the Linnean types. These three papers presented the 
nomenclature of the Linnean species as follows, as compared with 
Tuckerman’s and Dr. Zahlbruckner’s treatments. 
Tuckerman, based on E. Fries: 
Usnea barbata (L.) Fr. 
barbata a, florida Fr. 
barbata a. florida *hirta Fr. 
barbata a. florida **rubiginea Michx. 
barbata b. ceratina Schaer. 
barbata c. dasypoga Fr. 
barbata d. plicata Fr. 
barbata e. articulata Ach. 
Author’s 1909 paper: 
Usnea barbata (L.) Fr. 
barbata florida (L.) Fr. 
Contingent phases: Usnea barbata hirta 
barbata rubiginea 
barbata florida f. strigosa Ach. 
barbata ceratina (Ach.) Schaer. 
barbata dasypoga Fr. 
barbata plicata Fr. 
barbata articulata Ach. 
Author’s 1910 paper, based on Crombie: 
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