292 University of California Publications in Botany [Vol.7 



Frond 1-1.5 mm. high, broad and shortly stipitate, expanding 

 directly and abruptly to broadly oblong oi- cordate, margins crisped 

 and inrollcd, dark bluisli green; mciubrane 17-20/x tliiek, cells not 

 groui)ed into distinct areolae and not separated by interstitial lines; 

 akinetes not seen; aplanospores up to 512 from a single cell (8X8 

 X 8), but often only 128; cells palisade-like and 10-12/x in vertical 

 diameter, in section twice or more times as high as broad. 



Growing at or near the upper tide mark on rocky islets. Sitka, 

 Alaska. Type no. 3981, Gardner. 



Prasiola delicata has a decidedly thinner membrane than any other 

 of our marine species, shows little areolation, and has a larger number 

 of aplanospores formed within a single aplanosporangium. These 

 characters seem to indicate its just claim to be considered a distinct 

 species. 



Entocladia cingens sp. nov. 



Plate 23, figure 7 



Thallo textum pseudoparenchymaticum filamenta hospitis cingens 

 et intus membranam, sed filamenta marginalia ad longitutlinem hos- 

 pitis parallela ostendens mox formante ; cellulis centralibus fere isodia- 

 metricis, 5-8yu, diam., tardiore augescentibus et in sporangia trans- 

 formatis ; cellulis filamentorum liberorum marginalium 3-4/j, diam., 

 2-3-])lo diam. longioribus, terminalibus longis, conicis. 



Thallus early forming a pseudoparenchymatous tissue surrounding 

 the filaments of the host within the membrane, having a few marginal 

 filaments extending parallel with the long diameter of the host ; cells 

 in the center of the thallus nearly isodiametric, 5-8/x diam., enlarging 

 later to form sporangia ; cells of the free marginal filaments 3-4;a diam., 

 2-3 times as long as the diameter, terminal cells long, conical. 



Growing within the membrane of Chaetomorpha calif arnica Wille. 

 Southern California (Ocean Beach, near San Diego), December. Type 

 no. 3528fl, Gardner. 



The plants of this species seem to be nearing maturity in December, 

 since a few empty cells in the center of the thallus were found from 

 which reproductive bodies probably had escaped. Aside from this 

 condition, nothing further is known of its method of reproduction. 



Entocladia cingens is placed in this genus on account of the re- 

 semblance of the vegetative development to that of the type species, 

 E. viriclis Reinke, and because it has the same endophptic habit as 

 has that species. It differs from E. viridis in having the branching 

 filaments more closely coalescent, the enlarging cells in the main ])ai-t 

 of the thallus soon forming a pseudoparenchymatous tissue, leaving 

 only a few free marginal filaments. 



