282 Rhodora [December 



decidedly crispate, presenting much the appearance of a Fossombwnia, 

 and the purple rhizoids increased the resemblance. The only accom- 

 panying species was Marehaittia polymorpha, although PeUia epiphylla 

 grew in the near vicinity. 



2. SCAPANIA hyperborea Jorgensen, Forh. Vidensk.-Selsk. Christi- 

 ania 1894 s : 56. 1S94. S. irrigua var. alpina Bryhn, Nyt Mag. Xaturw. 

 40: (i. 1902 (in part). MartineUia hyperborea Arnell & Jensen, 

 Naturw. Unters. Sarekgebietes 3: 97. 1907. On rocks above timber 

 line. Mt. Katahdin, Maine, August 27, 190S (A. W. E.); Mt. Lafay- 

 ette, New Hampshire, July, 1908 {A. Lorenz). 1 New to the North 

 American mainland but previously reported from Greenland by 

 C. Jensen. 2 



This interesting species was first described from male plants col- 

 lected in Norway. It was overlooked by K. M idler, when he published 

 his monograph of Seapania in 190"), but was redescribed two years 

 later by Arnell and Jensen, as indicated in the synonymy. They 

 were able to add an account of the female plant and to cite the species 

 from Sweden, as well as from Norway. In 191 5 Mi'iller 3 recognized 

 the validity of S. hyperborea as a "kleine Art" and published excellent 

 figures of it. He considers it an arctic species but admits the possibil- 

 ity of its being found on the high mountains of Central Europe. 

 Through the kindness of Dr. Arnell, who has devoted much attention 

 to the European and Siberian species of Seapania, the writer has been 

 able to study three Scandinavian specimens of S. hyperborea, and 

 these agree in all essential respects with the New England specimens 

 listed above. 



The plants grow in dense mats, sometimes in admixture with other 

 Hepatieac, and are distinguished by a brown or reddish brown 

 pigmentation. The somewhat rigid leaves are imbricated and the 

 two lobes, in typical cases at least, arch only slightly or not at all 

 across the stem. The keel is relatively long and is straight or some- 

 what arched, a narrow entire wing being sometimes present. The 

 dorsal lobe tends to be convex but is sometimes reflexed; it is broadly 

 ovate in outline and usually measures 0.8-1 mm. in length by 0.7-0.9 

 mm. in width. The apex varies from rounded to bluntly pointed, the 

 margin is entire or vaguely sinuate, and there is little or no decurrence 



1 Listed by Miss Lorenz under the name S. curta, Bryologist 11: 114. 1908. 



1 Meddel. om Grcmland 43: 166. 1910. 



» Rabenhorsfs Kryptoganien-Flora •*: 415. /. 121. 1915. 



