NO. 1 DAWSON : MARINE RED ALGAE OF PACIFIC MEXICO 129 



Corallina vancouveriensis var. lycopodioldes 



(Taylor) comb, nov. 



Corallina gracilis var. lycopodioides Taylor, 1945, p. 200, pi. 65. 



In this variant the dissection of the lateral branchlets into successive- 

 ly finer pinnae is outstanding as well as the usually prominent develop- 

 ment of the verticillate branching. The densely appressed segments are 

 much reduced in diameter, sometimes to only 1/10 the diameter of the 

 main axis. The general form is lax, the main axes being very prominent, 

 percurrent, relatively few in number, and usually more or less denuded 

 in lower parts. Plants of this variety seem to be confined to the southern 

 part of the range of the species, being known only from collections from 

 southern California and Baja California. They are often to be found in 

 the most exposed situations subject to heavy surf, often forming dense 

 stands on mussels. 



Collins' Corallina gracilis var. densa represents a plant somewhat 

 intermediate between Yendo's type of C. vancouveriensis var. densa and 

 Taylor's C. gracilis var. lycopodioides, but is more like the latter. Since 

 Collins' name cannot stand in combination under C. vancouveriensis, 

 and since it seems unwarranted to provide it with a new name because 

 of its similarity to C. vancouveriensis var. lycopodioides, it may best be 

 recognized simply as a synonym essentially equivalent with the latter. 



Corallina gracilis Lamouroux 

 Plate 25, fig. 3 



Lamouroux, 1816, p. 288, pi. 10, figs, la-b; Taylor, 1945, p. 200. 



Thalli saxicolous, rarely epiphj^tic, 4-10 cm. high, loosely bushy, 

 consisting of several erect axes from the basal stratum, usually progres- 

 sively more densely branched toward upper parts; branching more or 

 less strictly distichous, opposite-plumose-pinnate; intergenicula of main 

 axes subcylindric below, compressed and more or less cuneate above, 550- 

 750 ju. long, 350-450 ii in diameter; main axes several times apparently 

 trichotomously branched, the branches in turn with irregularly pinnate, 

 indeterminate branches; ultimate, indeterminate pinnules simple or 

 forked, of one to several segments, subulate, 75-130 jx in diameter; tetra- 

 sporangial conceptacles terminal, appearing long-pedicellate on ultimate 

 pinnules, ovoid, antenniferous, 300-400 (450) ju, in diameter; sexual 

 plants not observed in the Mexican material. 



Type: Holotype not designated, but represented by a specimen 

 without date or locality in the Lamouroux Herbarium, Institut Botani- 

 que, Universite de Caen, France. Isotype fragments are on sheet 55423 

 in HAHF. 



