308 CARDOT AND THERIOT 



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 R. 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 a -£.) 



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

 ramosissimus, ramis confertis, erectis, brevibus, 3-5 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, 35-40 p. crassa, paulo sub apice eva- 

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

 sublinearibus, haud sinuosis, omnibus caeteris rotundatis vel brevissime 

 ovatis, 8-12 {j. latis, parietibus incrassatis, levibus sed valde convexis, 

 ita ut papillas maximas aamulent. Folia perichaetialia 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 granuloses, diam. 16-17 /x. Caetera 

 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); Kodiak (Trelease, 

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



Rhacomitrium heterostichum affine (Schleich.) Card, and Th6r. 

 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 Coe, 655) ; Hall Island (Trelease, 1777, 1778) I St. 

 Matthew Island (Trelease, 1856). 



Number 1949 is the ioxm falcata Boul. Numbers 1777, 1778 and 

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

 chous ; leaves erect-appressed.) 



