124 MINNESOTA BOTANICAL STUDIES. 



81. Amblystegium brevipes CARD. ET THER. sp. nov. (Plate 



XX., 2.) 



E. sectione A. riparii. Caulis gracilis, repens, ramis brevi- 

 bus. Folia erecto-patentia, circa 1.2 millim. longa, .6 lata, late 

 ovata, breviter acuminata, integra, costa angusta, basi 30 p. lata, 

 ultra medium evanida, saspius ad % vel ^ folii producta, rete 

 laxiusculo, cellulis basilaribus rectangulatis, nonnullis quadratis, 

 mediis subhexagonis, 55-70 jj. longis, 12-15 fj. latis, superioribus 

 brevioribus latioribusque. Folia perichaetialia late ovata, in 

 acumine angusto subito constricta, ad basin acuminis saepe ir- 

 regulariter denticulata, ultra medium costata. Capsula in pedi- 

 cello brevi pro more 10, varius 1.5 millim. longo, oblongo-arcu- 

 ata, sicca sub ore constricta, operculo conico. 



This species differs from the small forms of A., riparium by 

 the shortly acuminate leaves, the looser areolation, the shape of 

 the perichaetial leaves, and the short pedicel. A species from 

 the Caucasus, A. argillicola Lindb., of which we know only 

 the description published by Dr. V. F. Brotherus in his valuable 

 paper, Enumeratio Muscorum Caucasi, seems to be nearer to 

 this species, but still stands distinct from it by its leaves, which 

 are minutely denticulate from almost the base, its longer costa, 

 vanishing below the apex, and its narrower perichaetial bracts 

 with a less distinct nerve. 



Habitat : .Near Montevideo (June 15) ; at Hartford (June 27). 



82. Amblystegium compactum (C. M.) AUST. (Determined 



by Prof. L. S. Cheney, and by Messieurs Cardot & 

 Theriot.) 



M. Cardot remarks on the several forms of this species that 

 he does not separate A. subcompactum and A. dissitifolium of 

 Kindberg. 



Along shady, moist banks of rivulets, at Hartford (June 27). 

 At Foster (June 29). 



83. Amblystegium irriguum (WiLs.) B. S. (Determined by 



Cardot & Theriot.) 



On moist, shaded ground at Hartford (June 27). 

 At Foster (June 29). 



84. Amblystegium riparium (HEDW.) B. S. (Determined by 



Cardot & Theriot.) 

 On stones near the water's edge, at Cedar Lake (June 18). 



