504 Universitij of California Publications in Botany [Vol.8 



assimilating filaments briefl}^ tapering" near the base, and long and 

 gradual tapering above, variable in size, 20-70/a, mostly 40-50/x, diam. 

 not ending in a hair ; cells 0.5-2 times as long, cell wall thick ; chro- 

 matophores in actively growing cells a network extending throughout 

 the cell, later becoming- granular; zoosporangia narrowly cuneate, 

 rounded above, 90-llOju, long, 22-26/a diam., 200 or more spores escap- 

 ing at the apex in a utricle ; gametangia unknown. 



GroAving on different species of Fucus in the lower littoral belt. 

 Sitka, Alaska, to central Oregon (Coos Bay). 



Areschoug, in Linnaea, vol. 16, 1842, p. 235, pi. 8, figs. 6, 7. 

 Conferva fucicola Velley, Mar. PI., 1795, no. 4. 



This species was first reported as being in our region by Ruprecht 

 in 1851 (p. 389) from Sitka. No subsequent report of its having been 

 collected had come to us until one of us (Gardner) collected it in 1917 

 at the same station. 



There seems to be some question as to the exact limits of Elachistea 

 fucicola, but it has appeared most reasonable to us to adopt, as typical, 

 the plant figured by Kuetzing in the Tabulae Phycologicae (vol. 7, 

 pi. 95). We find plants within our territory corresponding in general 

 to Kuetzing 's figure and epiphytic on species of Fucus. The free 

 filaments are long attenuate at both the tip and the base. They vary 

 decidedly in diameter and in length and breadth of cells even in the 

 same individual, and the paraphyses are decidedly curved and de- 

 cidedly moniliform, with the uppermost cells usually as long as, or 

 longer than, broad. Our plants agree fairly well, also, with no. 417 of 

 the Phykotheka Universalis collected at Warnemiinde on the north 

 coast of Germany by Heiden. Our figure (plate 38, figs. 33-35) gives 

 the essential characteristics of structure. Elachistea fucicola is usually, 

 at least, more olivaceous than E. lubrica and all parts of the plants are 

 firmer and collapse less on drying than do those of E. lubrica. Thus 

 far we have detected E. fucicola. only on species of Fucus. 



2. Elachistea lubrica Rupr. 



Thallus usually forming distinctly separate tufts, 3 mm.-2 cm. 

 (9-11 mm. Rupr.) high, lubricous; mass of paraphyses relatively 

 small and loosely intertwined ; hairs absent ; erect free filaments 

 abruptly attenuated at the base, and gradually attenuated above the 

 center, 18-22/a diam. at the base, 38-48/i, in the widest part, tapering 

 to 9/7. or less at the apex ; cells of erect filaments cylindrical to slightly 



