NO. 2 DAWSON : MARINE RED ALGAE OF PACIFIC MEXICO 255 



Grateloupia abreviata Kylin 

 PI. 10, fig. 52 



Kylin 1941, p. 10, pi. 2, fig. 3 (invalid for want of Latin diagnosis) ; 

 Hollenberg 1948, p. 157. 



Inasmuch as material is at hand from Punta Banda, Baja California, 

 which seems clearly identical with the plant described and figured by 

 Kylin from La Jolla, California, it seems justifiable to present here a 

 Latin diagnosis in order to validate Kylin's name for the species. Kylin's 

 short description and remarks are quoted below in full, although the 

 illustration presented here is of the Punta Banda plant. 



"Grateloupia abreviata Kylin nov. sp. — Taf. 2 Fig. 3. 



"Thallus 3-5 cm. hoch, abgeflacht, unregelmassig gabelig verzweigt; 

 Aste 2-3 mm. breit, oft mit kleinen Prolifikationem von dem Rande; 

 Rindengewebe mit 6-7 Zellschichten ; Thallus tief rotviolett, etwas 

 knorpelig. 



"La Jolla; an Steinen in der mittleren Litoralregion ; mit Tetra- 

 sporangien im Juni." 



Thallo 3-5 cm. alto, complanato, irregulariter dichotomose raml- 

 ficato; ramulis 2-3 mm. latis, saepe proliferationibus exiguis e margin- 

 ibus; cortice e 6-7 stratis cellularibus ; thallo fusco rubido-porphyreo, 

 paulum cartilagineo. 



Thalli 3-5 (or to 7) cm. high, consisting of one or a few much- 

 branched and divided, flat blades from a fleshy holdfast which may be in 

 part discoid and partly clasping or surrounding coralline algal bases or 

 debris on the substrate ; erect parts at first substipitate, compressed, about 

 1.5 mm. broad, once or more times irregularly branched within 1 cm. of 

 the base and the branches expanded gradually to 3-6 mm. broad in mid- 

 parts and 400-600 /a thick, the margins sometimes tending to be thicker 

 than the middle ; upper parts of blades irregularly pinnately, subdichoto- 

 mously or subpalmately branched or lobed and often twisted or more 

 or less contorted, the ultimate segments mostly 1-2 mm. broad; medulla 

 moderately dense, of ramified filaments about 7 /a in diameter and more 

 longitudinally arranged toward the center, but outwardly grading 

 directly into the cortex of anticlinal filaments without the occurrence of 

 a subcortex of larger rotund cells, the pigmented cortical filaments of 

 4-5 cells ; tetrasporangia scattered in the cortex throughout upper thallus 

 parts, 33-38 fi long, 9-10 fi wide; sexual plants not seen. 



Type: Holotype is a specimen collected by Kylin in June 1922, in 

 the Kylin Herbarium, University of Lund, Sweden. 



