346 EVANS [ 2 9 2 ] 



by very irregular, more or less laciniate scales, connate with each 

 other and with the base of the pseudoperianth ; lacinice of the scales vari- 

 ously dentate or ciliate; pseudoperianth cylindrical or obovate, mouth 

 slightly contracted, irregularly lobed and finely denticulate from pro- 

 jecting cells ; calyptra about half as long as pseudoperianth : $ scales 

 sometimes distant and arranged in two distinct rows, one along each 

 side of the midrib, sometimes more imbricated and less definitely 

 arranged, variously connate with each other or free, margins irregu- 

 larly lobed and toothed with sharp and often ciliate divisions ; anther- 

 idia i to 3 in each axil, borne on short stalks; paraphyses few: cap 

 sule oval, on a long stalk, brown, valves several cells thick in the 

 middle ; spores brownish or greenish, the wall with fine, irregularly 

 curved and angular ridge-like thickenings, scarcely forming a net- 

 work ; elaters rather broad in the middle tapering to each end, spiral 

 bands i or 2, broad, brownish. 



Thallus 3~3-5 mm. broad, wings 0.7-1 mm. broad on each side of 

 midrib, cells of wing 24 //. in diameter, pseudoperianth 34 mm. 

 long, 1-1.3 mm - ' in diameter, $ scales about 1.2 mm. long, antheridia 

 0.25 mm. in diameter, capsule 1.2 x 0.6 mm., spores 25 /* in diam- 

 eter, elaters 0.1-0.2 mm. long, 12 p. wide in broadest part. 

 Yakutat (C. & K. 1145). New to Alaska. 



PaUa-oicinia hibcrnica has already been recorded from British Co- 

 lumbia 1 and has a wide distribution in Europe. The Alaskan material 

 includes both male and female specimens. The female plants are old 

 and the pseudoperianths are mostly withered, but a few of them show 

 the characteristic capsules. The male plants are robust and in excel- 

 lent condition and show several indistinct rows of crowded antheridial 

 scales on the upper surface of the midrib. According to Limpricht 2 

 and some of the older European writers, these scales should alternate 

 with each other and be arranged in two longitudinal rows. Among 

 the European material studied, the only male plants which I have 

 been able to examine were collected in Ireland by Moore and distrib- 

 uted by Rabenhorst in Hep. eur. exsic. no. 295. These have old and 

 empty antheridial scales, almost as crowded as in the Alaskan speci- 

 mens, and certainly arranged in more than two ranks, and this irregu- 

 larity of arrangement is also described by Leitgeb. 3 The scales in the 

 Irish plant are a little more toothed than in the Alaskan, but the speci- 

 mens agree so perfectly in all other respects that I have no hesitation 

 in pronouncing them the same. 



! Cf. Underwood, Zoe, i : 365. 1891. 



2 Cohn, Kryptogamenfl. von Schlesien, i : 326. 1876. 



3 Unters. uber die Leberm. 3 : 87. 1877. 



