160 Universif!/ of California Publications. [botany 



GEOGRAPHIC DISTRIBUTION. 



It is a rather interesting fact that the first specimens of such 

 marine composites should have been collected in the Antarctic; 

 regions and the last near the Arctic regions, though not within the 

 Arctic Circle. It is also noteworthy that two composites have algas 

 in the same genus and all have fungi of the same genus, so that 

 they are very closely related in spite of the fact that they come 

 from opposite hemispheres. The Alaskan species, in all proba- 

 bility, is widely distributed along the Northern Pacific shores, 

 and may extend into the Arctic region. The Ulva-composite, 

 thus far collected only in San Francisco Bay, may extend up and 

 down the coast some distance. 



DESCRIPTIONS. 



Prasiola borealis, sp. nov. 



Fronds broad concave cuneate to broadly obovate, with a 

 stipe, or sessile, margins crenulate, crispate, or entire, bright 

 green, thin to medium, flabby and membranaceous; plants sub- 

 erect 0.5-1 cm. high, forming a small rosette of three or four 

 fronds from a small hold-fast. Cells in surface view quadrate 

 medium size, arranged in distinct tetrads with a well marked 

 space. The tetrads are disposed in quadrate or polygonal areas, 

 with wide spaces between them. Cells in cross section oblong 

 to oval or columnar, close together with a thick gelatinous cortex 

 on both surfaces. The cells are 11-14 m- vertical diameter and 

 4-9 H- horizontal. The frond is 33-4-') /x thick. 



Guignardia Ulv3e sp. nov. 



Perithecia numerous scattered irregularly over fronds, large, 

 conspicuous, dark brown to black, spherical, immersed in the 

 thallus of Ulva Californica Wille, but prominent on both 

 surfaces, 364-509 /* in diameter, vertex convex, pore simple, pale 

 to hyaline, opening on either side of the frond. Asci balloon 

 shaped, stalked, with eight spores, 53-57 /* long, 9 t^ wide. 

 Spores oblong to oval, thick walled with granular or oily con- 

 tents, hyaline, 10-13 /"• long by 3.5-7 p- wide. 



