422 BULLETIN OF THE BUREAU OF FISHERIES. 
Many forms of the species approach closely in appearance to U. fasciata and slightly to Entero- 
morpha linza. 
2. Ulva fasciata Delile. 
Ulva fasciata, Delile, 1813, p. 153, pl. 58, f. 5. 
Ulva fasciata, Harvey, 1858, p. 58. 
Ulva fasciata, De Toni, 1889, p. 114. 
Ulva fasciata, Collins, 1909, p. 216. 
P. B.—A. No. 221. 
Frond divided into more or less linear segments, margin smooth or undulate; in cross section the 
two layers of cells separate somewhat at the margin, which is rounded, with a small open space between 
the rows. 
Florida; West Indies; California; warm waters all over the world. 
Abundant in warm water of tide pool, northwest corner of ‘‘ Town Marsh,’’ Beaufort, N. C., resting 
on the bottom, summer. 
A variable species varying from forms with a central axis and lateral lobes (as in a pinnately com- 
pound leaf) to forms having almost a continuous sheet with lobes few and inconspicuous, sometimes 
dichotomous; frond more or less perforate; lobes 5 mm. to 5 cm. in width; margin smooth and even or 
much crisped and undulate. (In this last form it corresponds to forms of Enteromorpha linza.) The 
structure of the frond is similar to that of U. lactuca, except the margin, which resembles E. linza. On 
the California coast it is hard to draw the line between this species and U. Jactuca, either from the shape 
of the frond or from its structure. Four forms have been distinguished there, passing into each other 
more or less. 
At Beaufort the species is easily distinguished by the much-crisped, lobed thallus with decidedly 
undulate margins, and by the structure of the frond at the margins. It forms sheets of considerable 
extent, with lobes long or short, broad or narrow, much crisped and much perforate. No specimens have 
been found with decidedly pinnate lobes like some of those occurring on the California coast. Some 
specimens approach forma lobata (P. B.-A. No. 863), but are more crisped and muffled. Many lobes are 
long and narrow and much ruffled, resembling forma teniata (P. B.-A. No. 862). The species has been 
observed at Beaufort only in summer; its condition at other times of the year is unknown. This is the 
most northern station reported for the species on our Atlantic coast, and is probably its northern limit. 
Family 2. CHZTOPHORACE€ Wille. 
Ulotrichiacew, De Toni, 1889, p. rs1 (in part). 
Fronds filamentous, except in a few doubtful forms, usually much branched, some- 
times united in disklike expansions; cells uninucleate, with band-shaped or disk-shaped 
chromatophore, often somewhat divided or with projections; with one, rarely more 
pyrenoids; hairs almost always present, but vai1ying in character; asexual propagation 
by four ciliate, in some cases biciliate, zoospores, by aplanospores, akinetes, and with 
special Palmella and Schizomeris stages in many genera; sexual reproduction in many 
genera by gametes, similar to the zoospores. 
About 150 species, mostly fresh water, some marine, few aerial, etc., throughout the 
world. 
A family of doubtful limits, being differently defined by nearly every author. The 
present treatment follows that of Collins (1909). The methods of reproduction seem to 
vary in different members, but are imperfectly known in the majority of cases. 
EEY TO GENERA. 
Thallusinicellqwall oftalgacts .0 ‘lived: SERRE Bat C se8 7 lS loans nai SAR 1. Endoderma (p. 423). 
Thallus.onyshells} stones} eter 00%. 2h, DU SSS aerate. Sten hi Lae 2. Ulvella (p. 423). 
