280 CARDOT AND THERIOT [320] 



Bryum laurentianum sp. nov. 

 (PI. xix, fig. 3 .) 



Elatum, densissime cespitosum, lutescenti-viride. Caulis 3-4 ccntim. 

 altus, radiculosus, laxiuscule foliosus, ramis numerosis erectis sub- 

 clavatis. Folia sicca et madida erecto-imbricata, ovato- vel oblongo- 

 lanceolata, circa 1.5 millim. longa, 0.75 lata, acute acuminata, mar- 

 ginibus planis inferne integris, superne distincte denticulatis, costa 

 valida demum f uscescente, basi 80-100 //. crassa, sensim attenuata et sub 

 apice evanida, cellulis basilaribus rectangulis, mediis superioribusque 

 rectangulis vel oblongo-subhexagonis, long. 40-75/1, lat. 14-17, mar- 

 ginalibus 4-5 seriatis, longioribus angustioribusque, linearibus, par- 

 ietibus paululum crassioribus, limbum parum distinctum efformantibus. 

 Caetera ignota. 



From St. Lawrence Island (Trelease, 1871). 



This species, which seems to belong to the group of B. alpinum 

 Huds., is chiefly characterized by its more acuminate and distinctly 

 denticulate leaves, and by its nerve disappearing below the apex. 



Bryum leptodictyon Philib. sp. nov. 



(PI. xvin, fig. 3-/.) 



Dioicum, gregarium, pallide vel lutescenti-viride. Caulis erectus, 

 simplex, 4-6 millim. altus. Folia sicca imbricata, madida erecta, 

 inferiora minora, ascendendo majora, anguste lanceolata, sublinearia, 

 sensim longeque acuminata, 1-1.8 millim. longa, 0.35 lata, basi hand 

 decurrente, marginibus planis inferne integris, superne minute dentic- 

 ulatis, costa angusta, basi 55 p crassa, percurrente, rete perfecte 

 weberaceo, cellulis uniformibus linearibus, mediis 4560 fj. longis, 5 

 6 latis. Capsula in pedicello rubello flexuoso, 1.5-2 centim. longo, 

 abrupte pendula, oblonga, parva, 2 millim. longa, 0.8-0.9 crassa, 

 pallida, collo brevi attenuata, operculo conico apiculato. Peristomium 

 perfectum, dentibus basi rubris, ciliis appendiculatis. Sporae leves, 

 diam. 9-12 /j.. 



From Hidden Glacier in Russell Fiord (Coville and Kearney, 964) . 

 Species very distinct, having quite the facies and areolation of a 

 Weber a with the peristome of Bryum. 



Bryum heterogynum Philib. sp. nov. 



(PI. xix, fig. 2 a ~ff.) 



Dioicum. Cespites humiles, intense rubri, aetate vinosi, basi terra 

 obruti. Caulis erectus, radiculosus, ramosus, 5-12 mill, altus. Folia 

 sicca erecta, madida erecto-patentia, ovato-lanceolata,i.5 millim. longa, 



