268 CARDOT AND THERIOT [38] 



On the original specimen collected by Palmer, and which Kindberg 

 himself formerly communicated to us, the costa has exactly the same 

 length and the same structure as in /?. tenuinerve. The latter is a 

 form with long simple or hardly branched stems, whereas R. palmeri 

 is a shorter and more ramulose form. 



Rhacomitrium cyclodictyon sp. nov. 

 (Plate xv, fig. 3-*.) 



Dioicum? parvum, dense cespitosum, atrofuscum. Caulis depressus, 

 ramosissimus, ramis confertis, erectis, brevibus, 35 millim. longis. 

 Folia siccitate suberecta vix flexuosa, madore erecto-patentia, 1.25 mil- 

 lim. longa, 0.5 lata, ovato-lanceolata, mutica, integerrima, inferne mar- 

 ginibus revoluta, costa sat tenui, 3540 p. crassa, paulo sub apice eva- 

 nida, rete subaBquali, cellulis infimis juxta costam paucis rectangulis vel 

 sublinearibus, haud sinuosis, omnibus caateris rotundatis vel brevissime 

 ovatis, 8 12 fj. latis, parietibus incrassatis, levibus sed valde convexis, 

 ita ut papillas maximas aemulent. Folia perichastialia multo majora, 

 e basi subvaginante sensim et longe acuminata, madore erecta. Cap- 

 sula in pedicello brevi, purpureo, demum nigricante, siccitate sinistror- 

 sum torto, 5 millim. longo, erecta, anguste cylindrica, 1.5 millim. 

 longa, 0.3 crassa. Sporae minute granulosae, diam. 16-17;*. Cetera 

 ignota. 



From Muir Glacier (Trelease, 2431). 



A most remarkable species, which cannot be mistaken for any 

 other on account of its characteristic areolation very different from that 

 of all known species of the genus Rhacomitrium. 



Rhacomitrium heterostichum Brid. Mant., p. 79. 



From Hot Springs (Trelease, 1773, 1774) 5 Kodiak (Trelease, 

 1776); Orca (Trelease, 1961 in part). 



Rhacomitrium heterostichum affine (Schleich.) Card, and The>. 

 From Unalaska (Trelease, 2296). 



Rhacomitrium lanuginosum Brid. Mant., p. 79. 



From Juneau (Setchell, 1240) ; New Metlakatla (Trelease, 1949) ; 

 Virgin Bay (Trelease, 1775); Sitka (Trelease, 1772); Kodiak 

 (Brewer and 06,655); Hall Island (Trelease, 1777, 1778); St. 

 Matthew Island (Trelease, 1856). 



Number 1949 is the immfalcata Boul. Numbers 1777* J 77^ ant * 

 1856 belong to a form stricta. (Branches rigid when dry, subdisti- 

 chous ; leaves erect-appressed.) 



