534 University of California Puhlications in Botany [^^ol. 8 



4. Scytosiphon Lomentaria f . cylindricus maculatus 



Plate 42, figs. 61, 62 



Fronds 3-4 em. hig^h, cylindrical, not constricted, dark brown in 

 color ; g'ametangia 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. 



