HILDEBRANDTIA. 61 



Syn. Trentepohlia pulchetta, Ag. Conferva nana, Dillw. 



Not as frequent as the preceding ; in fresh running waters. 

 Plate LXIX, fig. 13, natural size, fig. 14, two stems mag- 

 nified 125 diameters. Figs. 15, 16, clusters of carpogons. 



CHANTRANSIA PYGMAEA, Kg. 



Tufts dark, steel blue or greenish, 2-3 mm long, radiating 

 branches erect patent with rounded terminal cells. 



Diameter of cells, 11-14 ^ 2-3 times as long. 

 On wood and grasses in spring water. 



Plate LXVII, fig. 1, natural size ; figs. 2, 3, stems magnified 

 125 diameters ; figs. 4, 5, cluster of carpogons ; (tetra-spor- 

 aiigia. ) 



CHANTRANSIA VIRGATULA, (Harv.) Thur. 



Grows usually as a close fringe 1-4 mm long, on Zostem 

 and various marine algae. Filaments about 46 yw diameter, 

 articulations 3-4 times longer than broad ; sterns rather 

 straight, branches alternate or secund, rarely opposite; 

 tetra -sporangia on short branchlets, single or rarely twin ; 

 terminal cells often piliferous. 



Syn. Trentepolilia virgatula, Farl. C. luxurians, J. Ag. ; C. pili- 

 ferumj Kg.; C. Lenormandi, Suhr. 



Mostly in sheltered coves along the New England coast. 

 More of a Marine than a Fresh-water plant. 



Plate LXVII, fig. 6, several plants magnified 125 diame- 

 ters ; fig. 7, tetra-sporangia ; fig. 8, natural size as a fringe on 

 Zostera. 



Family IV.HILDEBRANDTIACEJE. 



Thallus crustaceous, extended and firmly adhering, composed 

 of subcubical cells arranged in close vertical series. Tetraspores 

 in excavations in the surface. Sexual propagation unknown. 



Genus 7, HILDEBBANDTIA, Nardo. 



Smooth, purplish, crustaceous, forms a firmly attached coating 

 on stones. Propagation asexual by means of tetraspores which 

 are imbedded in pear-shaped cavities under the surface of the 

 thallus. 



HILDEBRANDTIA RIVTJLARES, Ag. 



Thallus forms a bright, purplish, smooth crust, on river 

 stones. Tetra-sporangia pear-shaped. Cells of the thallus 



