532 



Grout: Revision of North American 



In 



done at the Herbarium of Columbia University and was made 

 possible by the kindness of Prof. Underwood and Mrs. Britton. 



SCLEROFODIUM ILLECEBRUM (L. /./.) Br. Sch. Biy. Eur. 



//■ 



Muscus 



557^ 1853 



»* 



pi- 25- f. 7- 1727. 



acimilis 



Hypiium illccehnmi L. /./ 

 , Hyp 



Hyp 



■ ifyp- 



2: 176. 182;. Suppl. //. J. 1827. 



I8I2. 



225. I8I6. 



Muse. Brit., Ed. 



Gametophyte in wide spreading mats, varying from dirty 

 green to bright glossy green: stems 3-10 cm. long, creeping 

 n-regularly divided, irregularly or often subpinnatcly branching 

 partially denuded of leaves in the older portions, sparingly radicu- 

 lose, younger portions ascending and much like the branches • 

 branches short, rarely reaching i cm. in length, julaceous, tumid' 

 ascending to erect, more or less arcuate, usually obtuse ■ branch- 

 leaves appressed imbricate when dry, erect open when moist vary- 

 ing greatly m shape ; those from the middle of the larger branches 

 broad y ovate to oblong-ovate, 1.2x0.6 mm., abruptlv narrowed 

 to a short point, finely and sharply serrate above, sometimes nearly 

 entire, very concave, slightly sulcatc when dry, smooth when 

 moist, not decurrcnt but half clasping, acumination of leaves 

 often squarrosc -spreading when dry; costa extending 3/ the 

 length of the leaf, sometimes ending in a dorsal spine ; niedian 

 cells hnear-vermicular, 0.005 '"m- wide and 12-18 : i, apical much 

 shorter; basal subquadrate, colored and thicker walled- alar 

 somewhat larger and less deeply colored ; leaves of the shorter 

 branches and upper and lower leaves of the longer branches often 

 lack tlie acummation and are obtuse or obtusely acute • stem leaves 

 averagmg larger, in robust plants reaching 2. 3 x i mm., gradually 

 tapering to a longer acumination, nearly or quite entire, tho.se ot 

 the younger .stems scarcely to be distinguished from the branch 

 leaves. Dioicous : perichaetial leaves oblong-lanceolate, gradually 

 narrowed above to a slender entire or subdenticulate acumination 

 faintly costate, acumination less slender than in S. cacspitosinn 

 Sporophyte 1-2 cm. high : seta greenish brown, becoming red 

 brown with age, twisted to the right, very rough with large papillae • 

 capsule a little lighter colored than the seta, horizontal, unsym- 

 mctric or arcuate, with operculum 2.5 mm. lon^, 2.5-3 •' i ' oper- 

 culum long-conic, acute ; annulus of two rows of cells, easily de- 



