BV G. 1. I'LAYKAlli. 191 



Compare St. furcatum Breb. var. aculeatum Sclim., Hedw. 34, 

 1895, f.l9; St. ReinscUi Roy, in Cooke, T.51, f.4; St. Jorjicida- 

 tum Lund., Desm. Suec. T.4, f.5; and St. podlachicum Eich. k 

 Gutw., Alg. Nov. T.2, f.49. 



St. Botanense, n.sp. (T.iv. f. 19). 



St. parvum, tarn longum quam latum, medio sinu acutangulo 

 profunde constrictum. Semicellulae subcuneatae vel crateri- 

 formes, dorso planae, ventre inflato fere semicirculare, angulis 

 superioribus tissis et in aculeos binos, inferiores horizontales, 

 superiores divergentes, protractis. A vertice visae triangulares, 

 lateribus perfecte rectis, angulis acutissimis aculeis brevibus 

 singulis praeditis. Membrana glabra. 



Long. = lat. 30;i. 



Botany. > 



The most closely related form is St. tridentulum mihij see note 



above. 



St. Auburnense, n.sp. (T.v. f.lO). 



St. minutum, paullo latius quam longum, medio sinu amplo 

 profunde constrictum. Semicellulae subcuneatae vel crateri- 

 formes, dorso levissime convexae fere planae, ventre alte convexae; 

 lateribus aegre curvatis fere rectis ; angulis superioribus in 

 tubulos singulos radiatim productis, tubulis minimis, brevissimis. 

 A vertice visae triangulares, lateribus medio retusis interdum 

 distincte denticulato-asperis, angulis levissime inflatis et in 

 tubulos singulos productis granulis minutissimis in seriebus 

 tiansversalibus 4 ornatis. 



Long. 18-20; lat. 23-24/x. 



Auburn; Rose's Lagoon, Collector. 



Forma minor, n.f. 



Exacte ut in forma typica sed minor. An granuli nuUi '? 



Long. 12; lat. 16ju. 



Botany. 



Of similar shape is St. liexacerum Wittv- var. aversum West, 

 Desm. U. S. 1898, T.18, f.l3, but that is granulate irregularly. 

 Compare also St. tunguscamcm Boldt., Siber. Chlor. T.5, f 22, and 



