344 Lichenes. — Bryophj^ten. 



sanguineo-atra Th. Fr. and description of a new species: Lecanora 

 {Squamaria) marginalis Hasse, the type being from shaded Java and 

 Ibasallic rocks near Little Lake Station, Inyo County, California, 

 at 1000 meters altitude. Maxon. 



Howe Jp., R. H., A manual of the genus Usnea, as repre- 

 sented in North and Middle America, north ofthe 15th 

 parallel. (Bull. Torr. bot. Club. XXXVII. p. 1—18. pl. 1 — 7. 1910.) 



The following species and subspecies are recognized: Usnea 

 florido (L.) Web, with several contingent phases to which the names 

 Liehen hirtus L., U. ßorida var. ruhiginea Michx., U. ßorida var. 

 strigosa Ach. have been applied; U. plicata (L.) Web., which in its 

 various contingent phases includes those forms previously listed as 

 U. ceratina; U. plicata barbata (L.) R. H. Howe, which is the Liehen 

 barbatus of Linnaeus and the "C/. barbata c dasypoga Fr." of 

 Tuckerman; U. trichoidea Ach., U. aj'tictilata (L.)liofim., U. cavernosa 

 Tuck., U. angiilata Ach., U. longissitna Ach., all of which are treated 

 under the following headings: type locality, original description, 

 figures, synonymy, diagnosis, description, contingent phases, sub- 

 strata, geographical distribulion, and observations. All of these are 

 illustrated. 



The paper concludes with a list of citations with type localities 

 for all the described species of Usnea from North and Middle Ame- 

 rica, with mention of their equivalents. Maxon. 



Howe Jr., R. H., Lichens of Mt. Ascutney, Vermont. (The 

 Bryol. XIII. p. 85. July, 1910.) 



Lecidea platycarpa Ach. is reported from Mt. Ascutney by 

 the writer, bringing the total number of species to 45 now known 

 from this mountain. (See Bryologist, XIII, January, 1910). Maxon. 



Britton, E, G., Notes on nomenclature, XI. ''The ßryol. XII. p. 

 b2— 63. July, 1909.) 



A brief abstract of parts 234 and 235 of Engler and Prantl, 

 Die natürlichen Pflanzenfamilien, devoted to several families of 

 mosses, in which especial reference is made to the treatment accorded 

 to the American species. In addition, a new genus name and "com- 

 bination" are proposed, W illiantsiella tricolor, for a moss originally 

 named Syrrhopodon tricolor but m.ore recentl}^ placed in a new 

 genus dedicated by Brotherus to Mr. R. S. Williams. The new 

 genus name proposed by Brotherus (not here mentioned) is 

 invalidated by an earlier use of the name for a genus of rubiaceous 

 Philippine trees by E. D. Merrill in 1908. Maxon. 



Cokep, W. C, Liverwort tvpes for elementary classes. 

 (Torreya. IX. p. 233—236. Nov. 1909.) 



With respect to the "alternation of generations" in plants, which 

 finds its first conspicuous appearance in the Hepaticae, the author 

 advocates the Substitution (in elementary class work) of a simple 

 type in place of the generally adopted Marchantia, which, with its 

 complex thallus, its "stalked and still more complex archegoniophores 



