96 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 17 



35-60 ju, deep with a prominent but rather irregularly defined ostiole 

 usually slightly below the surface; tetrasporangia irregularly divided, 

 3.5-6.5 p. broad, 15-22 /x long, borne amid clearly defined paraphyses. 



Type: Holotype not designated and whereabouts of Nardo's orig- 

 inal material unknown to the writer. 



Type locality : Italian shore of the Adriatic Sea. 



Mexican distribution: Pacific Baja Calif. — D. 9448, Islas San 

 Benito, May; D. 9624, Isla San Martin, Apr.; D. 8730, outer San 

 Quintin peninsula, Jan.; D. 1248, Punta Baja, Apr.; D. 10414, Punta 

 San Eugenio, Nov.; D. 9971, D. 10093, 10-11 miles west of Punta 

 Malarrimo, Apr.; D. 9500, Punta Abreojos, Apr.; D. 9252, Punta 

 Pequena, May; D. 9363b, Punta Hughes, Isla Magdalena, May. Gulf 

 of Calif.— D. 757b-40, Isla Turner, Jan.; D. 7058, Isla Carmen, Mar.; 

 D. 3300, Cabeza Ballena, Nov. Revillagigedo Archip. — Taylor 39-7, 

 Isla Clarion, Mar. Nayarit — Taylor 39-675, Isla Maria Magdalena, 

 May. Jalisco— D. 3747, 3748, Barra de Navidad, Dec. Guerrero— 

 Taylor 34-563B, White Friars Islets, Mar. Oaxaca— Taylor 34-561, 

 Bahia Tangola-Tangola, Feb.; D. 3816, 3780, 3790, Salina Cruz, Jan. 



The vegetative cells of the Mexican plants seem to average some- 

 what smaller than those in plants from other parts of the world. A 

 great variation in thickness is evident throughout the collections, some 

 examples being nearly ten times as thick as others. The size and posi- 

 tions of the conceptacles and the irregular divisions of the tetrasporangia 

 appear to agree satisfactorily with the type variety of this cosmopolitan 

 species. 



Hildenbrandia prototypus var. kerguelensis Askenasy 



Askenasy, 1888, p. 30. 



Like the typical variety of the species, but the crusts usually over 

 250 [I thick and of a duller reddish color, and the tetrasporangia sub- 

 cylindrical to fusiform, 23-30 /i long, 7-11.5 //, wide and divided regular- 

 ly and zonately by parallel transverse walls. 



Type: Holotype not designated and whereabouts of the original 

 material unknown to the writer. 



Type locality : Kerguelen Islands. 



Mexican distribution : Pacific Baja Calif.— D. 9962, on stones 

 10 miles west of Punta Malarrimo, Bahia Vizcaino, April; D. 10572, 

 on rock surfaces, Punta Norte, Isla Cedros, Oct. 



These Mexican plants seem best referred to Askenasy's variety al- 

 though the tetrasporangia are somewhat larger than described. The 



