22 



differ from /. Schiffneri and /. pumila, both of which are characterized by a 

 paroicous inflorescence. 



If the dioicous species are left out of consideration and the two paroicous 

 species compared, it will be found that the latter are very closely related. The 

 size, habit, and color are much the same in both, and there are no essential differ- 

 ences in the shape of the leaves, in the size of the leaf-cells, in the walls of the 

 cells, or in the perichaetial and perigonial bracts. The perianths and the valves 

 of the capsule, however, yield important differences. In /. Schiffneri the perianth 

 contracts abruptly in the upper part, the broadest part being above the middle; 

 in /. pumila the perianth is gradually contracted toward the mouth, the broadest 

 part being usually at or below the middle. In /. Schiffneri the cells in the outer 

 layer of the valves have the thickenings in their radial walls arranged in such a 

 way that every alternate wall is nearly or quite free from thickenings; in /. pumila 

 the thickenings are present in equal abundance in all the walls. The walls of 

 the inner layer, moreover, are about half as large in /. Schiffneri as in /. pumila 

 and the spores are considerably smaller (about 15^1 and 2i/x, respectively). These 

 differences are clearl}^ brought out in the published descriptions. 



A third paroicous species of the Luridae was recently described by Schiffner 

 under the name Aplozia rivularis Schiffn.^ He had already called attention to 

 the plant under the name A. pumila var. rivularis Schiffn.,^ and it is described 

 under this name by Miiller.^ The species is now known from Bohemia, the Harz 

 Mountains and Saxony, specimens from the last region having been distributed 

 by Schiffner in his Hep. Europ. Exsic. No. 402. Since A. rivularis is probably 

 to be expected in North America a few words about its characteristics are perhaps 

 in place. It agrees closely with J. pumila but is much larger and has larger 

 leaf-cells (40 x 20// in the middle of the leaf, instead of 25 x i8/i). It differs also 

 in its large cylindrical or clavate perianths, in the narrower cells of the inner 

 layer of its capsular valves, and in its slightly smaller spores (about i6^t in di- 

 ameter). A. rivularis, as its name implies, grows on stones in streams. 



6. Cephalozia Loitlesbergeri Schiffn. Oesterr. Bot. Zeitschr. 62: 9. 

 1912; K. Muller, Rabenhorst's Kryptogamen-Flora 6-: 45./. 12. 1912. 



Collected in 19 15, at Barrasois, Cape Breton, Nova Scotia, by G. E. Nichols 

 (No. 1243 b); already reported by its collector.^ The type material of this 

 distinct species was found near the Ladachsee in the vicinity of Gmunden, Austria, 

 by C. Loitlesberger. Muller was able to add several new stations from Baden, 

 Styria and Switzerland, and Schiffner soon afterwards reported the plant from 

 Bavaria^ and Sweden.^ For the British Isles Macvicar' doubtfully recorded the 

 species from Lancashire, the specimens which he cites having poorly developed 



1 Lotos 59: 2. 191 r. 



2 c. 48: [5I. 1900. 



3 Rabenhorst's Kryptogamen-Flora 6: 568. 1909. 



4 Bryologist 19: 42. 1916. 



5 Oesterr. Bot. Zeitschr. 63: 162. 1912. 



6 Ibid. 63: 455- 1913- 



^Student's Handb. Brit. Hepat. 454. 1912. 



