320 CARDOT AND THERIOT 



BRYUM LAURENTIANUM sp. nov. 



(PI. XIX, fig. r-0.) 



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

 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, niar- 

 ginibus planis inferne integris, superne distincte denticulatis, costa 

 valida demum f uscescente, basi 80-100 /i crassa, sensini 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 efforniantibus. 

 Caetera ignota. 



From St. Lawrence Island (Trelease, 1S71). 



This species, which seems to belong to the group of £. 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. xviii, 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 ij. crassa, percurrente, rete perfecte 

 weberaceo, cellulis uniformibus linearibus, mediis 45-60 p. 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. Feristomium 

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

 diam. 9-12 11. 



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"-!'.) 



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

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

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



