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534 University of California Publications in Botany [Vol.8
color ;
4. Scytosiphon Lomentaria f. cylindricus maculatus
Plate 42, figs. 61, 62
Fronds 3-4 cm. high, cylindrical, not constricted, dark brown in
gametangia collected into definite, larger or smaller sori.
Growing on rocks exposed to heavy surf along high-tide level.
Central California (San Francisco).
Collins, Holden and Setchell, Phyc. Bor.-Amer. (Exsicc), no. 1235.
This form is distinguished by the presence of gametangia in groups,
giving the small fronds a warty appearance. It grows in exposed
situations in which the rocks are kept more or less moist continuously
by the spray, but for the most part the plants are not submerged in
pools.
5. Scytosiphon Lomentaria f . complanatus
major
Fronds flat, 9-14 cm. high, 1-2.5 mm. wide, dark brown in color,
soon changing to green on removal from the water.
Growing on rocks in the lower littoral belt. Pebble Beach, Carmel
Bay, Monterey County, California.
6. Scytosiphon Lomentaria f . complanatus minor
Plate 44, fig. 74
Fronds 3-5 cm. high, up to 1.5 mm. wide, irregular and variable
in thickness, cylindrical below and solid or hollow, flattened above
and hollow, light brown in color ;
gametangia composed of 5-7 loculi,
completely dissolving at maturity leaving the medulla clean ;
medulla
composed of two layers of cells, variable in size, much longer than
broad ; hairs and paraphyses absent.
Growing on stones along high-tide level or above. Fort Point, San
Francisco, California.
This form is a short-lived winter and spring form, usually matur-
ing in February and March, so far as our experience shows. It has
been detected for many years in the above mentioned habitat, often
found growing on wood as well as on a stone wall.