282 PROCEEDINGS OP THE AMERICAN ACADEMY 



Gen. RHIZOGONIUM, Brid. 



58. R. SPiNiFORME, Brnch. ; Hedw. 3Iusc. Frond. 3, t. 25. — Gi'ound, 

 near the roots of trees ; common. 



Gen. BRYUM, Dill. 



59. B. ARGENTEUM, L. / Bryol. Europ. t. 384 ; var. lanatum. — On 

 the ground ; common. 



60. B. CORONATUM, Schwcegr. Suppl. t. 71. — Old logs in fields. 



61. B. C^SPITICIUM, L. ; Bryol. Europ. t. 374. — On the ground. 



62. B. LEPTOCLADON (s/j. nov.) : dioicum tenellum laxe cajspitosum 

 flavescenti-viride ; caulibus brevissimis prostratis, innovationibus per- 

 multis erectis julaceis tenuissimis remotifoliis ; foliis appressis oblongis 

 breviter acutatis cymbiformi-concavis e cellulis amplissimis pellucidis 

 inferne oblongis superne elongato-rhomboideis areolatis, unica serie 

 cellularum indistincte marginatis, costa cum apice evanida ; capsula 

 oblongo-pyriformi leniter inclinata late annulata ; perist. int. ciliis 

 lanceolato-linearibus vix pertusis, ciliolis nuUis ; operculo hemisphjErico- 

 apiculato. — Moist places on the ground. — A very small species, 

 forming loose yellowish-green patches, well marked by its numerous 

 thread-like innovations, f lines high, and about ^ of a line wide. 

 Leaves with a large areolation in proportion to their size. Pedicels 

 5-6 lines high. This species belongs to MuUer's section Areodictyon 

 of Bryum. 



63. B. OVALIFOLIUM (sp. nov.) : dioicum casspitans ; foliis laxius- 

 culis ovali-oblongis obtusiusculis modice cochleariformi-concavis, mar- 

 ginibus planis erectis, apice subincurva lenissime serrulatis, areolatione 

 laxa, costa vix excurrente ; capsula oblongo- vel clavato-pyriformi 

 pendula. — Banks of rivulets. — A medium-sized species, distinguished 

 from its allies by its oblong-oval, borderless leaves, with erect margins. 



Ge7i. MNIUM, Linji. 



64. M. "Wrightii (sp. nov.) : dioicum coespitosum ; caule arcuato- 

 ascendente simplici complanato-folioso ; foliis dimorphis lateralibus 

 ovali-obovatis apiculatis dorsalibus accessoriisve multo minoribus an- 

 guste lanceolatis biseriatis, omnibus dissitis incrassato-marginatis ultra 

 medium costatis laxe rhomboideo-areolatis, apice serrulatis ; capsula in 

 pedicello erecto pendula pyriformi ; operculo depresso-convexo : flore 

 masculo terminali disciform!, pcrigonialibus lineari-lanceolatis. — Shady 



