302 Cla 



Wash 



tered stations in North America. It agrees with it also in the 

 structure of the thallus, the thickened median portion of which is 

 usually composed throughout of parenchymatous tissue. In this 

 respect both species differ markedly from P. Lyellii (Hook.) S. F. 

 Gray and its immediate allies, in which the thallus is characterized 

 by a median strand of narrow elongated cells, forming a very con- 

 spicuous feature of the plant P. Blyttii is a little more robust 

 than P. Flotoiviana and may be easily distinguished by its golden- 

 yellow rhizoids, by its bluntly lobed archegonial scales, and by 

 the ridges of its spores, which are beset with short and truncate 

 spines. In P. Flotozviana the rhizoids are white, the archegonial 

 scales are sharply cleft, and the ridges on the spores are smooth 

 along their margins. 



Nardia Breidleri (Limpr.) Lindb. 



Aliadaria Breidleri Limpr. Jahresb, Schlesisch. Gesells. fiir vaterl. 



Cultur 47: 311. 1880. 

 Nardia Breidleri Lindb. Medd. Soc. F. et Fl. Fenn. 6 : 252. 1880. 



On wet soil. Mount Ranier, at an altitude of 6300 feet, Allen. 

 An arctic and alpine species new to North America but widely 

 distributed in Europe and known also from Siberia. 



Nardia Breidleri grows in flat, depressed mats close to the 

 snow line and is greenish brown in color. It is much smaller 

 than our other species of the genus and looks at first sight more 

 like a Cephalozia. It even agrees with Cephalozia in the occa- 

 sional presence of postical branches, although the branching is 

 typically lateral, as in the other species o{ Nardia. The leaves in 

 N. Breidlen are either orbicular or a little broader than long and 

 are also more or less concave. They are often bifid one fourth to 

 one third, with obtuse sinus and rounded lobes, but are sometimes 

 only emarginate at the apex. The leaf-cells, mostly ro-i6/^in 

 diameter, have a smooth cuticle and thin walls destitute of trigones. 

 The underleaves are minute and subulate, although sometimes 

 vaguely bifid. Apparently the closest ally of the species is N. 

 Geoscyphiis (DeNot.) Lindb., which also may be recorded from 

 Washington. It is considerably larger than N, Breidleri, the 

 leaves are much more variable, being sometimes undivided and 

 sometimes variously bifid, and the leaf-cells, which measure 20-30/^ 



