84 



MEMOIRS OF THE NEW YORK BOTANICAL GARDEN 



Growing on rocks in association with Hepaticae and with 

 other species of Myxophyceae, about seven kilometers east of 

 Coamo, no. 1870, type. 



This species is closely related to H. scytonematoides of this 

 paper. The cells are more discoid and of a brighter green color, 

 and the sheath is thin, firm, not lamellose nor ocreate, 



Hassalia scytonematoides sp. nov. 



Plate 19, figure 44 



Filaments arcuate, densely intertwined among other algae, 

 together forming a flocculent stratum, branching freely and sin- 

 gly under the heterocysts, rarely geminate, 18-24 p diam. ; 

 trichome 15-19 m diam., pale aeruginous to purplish drab, con- 

 stricted at the dissepiments ; cells one-fourth to one-half as long 

 as the diameter, homogeneous ; heterocysts of the same shape 

 and size as the cells ; sheath lamellose and ocreate in part, pale 

 yellowish to dark brown. 



Growing on bark along the road to Monte Montoro, Maricao, 

 iw. 1087 a, type. 



Hassalia scijtoneniatoides is very intimately associated with 

 ditferent species of Scytonema and Stigonema. No pure ma- 

 terial was found in the whole Wille collection. It is a very dis- 

 tinct species but is liable to be overlooked on account of its close 

 resemblance to uni seriate Stigonemas and nearly related Scy- 

 tonemas. It may readily be distinguished when branching, 



Hassalia rugulosa sp. nov. 



Plate 19, figuke 45 



Filaments 150-250 n long, veiy mucli contorted, forming a 

 dense, flocculent stratum one-fourth to one-third mm. thick, black 

 on being dried, 14.5-17.5 [x diam. ; branching single under the 

 heterocysts, rarely geminate ; trichomes 6-9 [i diam. ; broadest at 

 the apices, narrowest at the bases ; cells pale blue-green, one-half 

 to one-third as long as the diameter at the apices, and torulose, 

 ciuadrate or longer in the older parts and almost cylindrical; 

 heterocysts usually a little Avider than the adjacent cells; sub- 

 spherical to very much compressed, 2-5 n long; sheath 3.5-5 m 

 thick, homogeneous, dark brown, roughened on the surface with 

 fine irregular granules. 



Growing on rocks by the road near San Lorenzo, no. 517, 



type. 



