240 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 12 



Gymnogongrus Griffithsiae (Turner) Martius, v. galapagensis 



Piccone & Grunow 

 Plate 80, Fig. 2 



Plants to 7.5 cm tall, dichotomously erectly branched, branches very 

 slender, subterete, when dry 75-225 /x diam., very locally dark red and 

 much swollen. 



Piccone in Piccone & Grunow 1886, p. 60, the type from I. San 

 Cristobal, Ecuador. 



Ecuador: Archipielago de Colon, I. Rabida, Hassler Expedition no. 

 1009, June 1876. Ibid., near high tide line on rocks near Black Beach 

 Anchorage, I. Santa Maria, nos. 34-263, 34-267 C, 18 Jan. 1934. 



Gymnogongrus martinensis Setchell & Gardner 



Setchell & Gardner 1937b, p. 78, pi. 12, fig. 31. 



The material assigned directly to this species reached a height of 3.5 

 cm and branched irregularly dichotomously 3 or 4 times in a rather more 

 wide-angled fashion than figured by the authors. However, the identifica- 

 tion was confirmed by detailed direct comparison with the type material 

 kindly loaned by the California Academy of Sciences. 



Mexico: Guerrero, on rocks, Ba. Petatlan, no, 34-580, 2 Mar. 1934. 



Gymnogongrus martinensis, f. 



Thallus small, dark red when fresh, dull and blackish when dry, ot 

 tough consistency, the base a small disk thin at the edges, the axis short, 

 stout, nearly cylindrical, when branched often dividing about its own 

 breadth above the base, to about 15 mm tall, simple or 1-3 times dichot- 

 omously branched, with occasional lateral proliferations, the branches 

 compressed below, flat and to 200-350 /a thick; structurally showing a 

 thick cuticle, a cortex of short 1-2 times branched anticlinal rows of as- 

 similatory cells, and a medulla of several layers of thick-walled cells with, 

 in the central portion, some slender filaments among them ; cortical cells 

 from the surface appearing 2.5-3.0 /x. diam., rounded, irregularly distrib- 

 uted except that they commonly appear in pairs, with thick lateral walls ; 

 reproduction from somewhat elevated darker nemathecia. 



This material seems to represent a dwarf form of G. martinensis, as 

 confirmed by comparison in detail with the type material. It differs in 

 some features, which have been elaborated in the description. 



Mexico: Is. Revilla Gigedo, scarce, on rocks forming little clumps 

 at about mid-tide level, with Gelidium pusillum, Braithwaite Bay, I. 

 Soccoro, no. 39-49B, 18 Mar. 1939. 



