(362) 



bia Falls, on green willows, rather darker colored and more 

 robust, Oct. (265). 



Orthotrichum affinc Schrad. On bark of the Douglas fir, 

 Columbia Falls. These specimens are very closely related 

 to the preceding and perhaps should be referred to it as a 

 short-stemmed variety of dryer places. Limpricht does not 

 give any very satisfactory differences by which the European 

 plants may be separated. O. speciosum is said to be a larger 

 plant with a little seta, capsule less ribbed, upper leaf-cells 

 .018-. 020 mm. instead of .01 2-. 014 mm. in diameter and 

 with larger spores (306). 



Orthotrichum rupestre Schleich. North Fork of Sun 

 River; Columbia Falls, July 18 (121). 



Orthotrichum rupestre var. A more slender form with 

 nearly smooth calyptra, June 15, Columbia Falls (384). 



Orthotrichum Macounii Aust. Highwood Mts. , June 2 1 , on 

 rock. Specimens referred here are near O. lacvigatum Zett., 

 which possibly is not found in America. The Montana 

 specimens have a cylindrical, exserted capsule, in size and 

 shape much like speciosum and more or less 8-ribbed, with 

 teeth mostly united in pairs and stout cilia between, but the 

 teeth are never strongly reflexed against the rim of the cap- 

 sule as in the latter (426). 



Orthotrichum Schlotthaueri Vent. Columbia Falls, on 

 rock, July 18. Very similar to the preceding and perhaps 

 scarcely a distinct species. It seems to differ only in having 

 teeth less united and smaller, less developed cilia (272). 



Orthotrichum obtusifolium Schrad. Columbia Falls, on 

 Cottonwood, June 10 (225). 



Mcrceya latifolia Kindb. (Plate 37.) River bank below 

 Great Falls, on rock constantly wet by spring. Compared 

 with specimens received from Professor Macoun and they are 

 undoubtedly the same. The leaves have both surfaces of 

 each cell covered with up to 6 or 8 small papillae, except 

 those constituting the peculiar broad often reddish-brown 

 border. These cells are smooth, with thickened walls and 

 more or less elongated at right angles to the leaf surface, 



