1925] Setch ell-Gardner: Melanophyceae 523 



where to place a particular genus. The genus Asperoeoccus, as 

 exemplified by A. buUosus Lamour. is distinct and definite as is also 

 Sormthera ulvoidea Kupr., and both of these are typical as to hollow 

 frond, manner of growth and type of sorus which is definite in outline, 

 with paraphyses and zoosporangia intermingled and with a group of 

 hairs more or less centrally located. The genus Halorhipis of Saunders 

 has also projecting sori with zoosporangia, but H. Wmstonii (C. L. 

 Anderson) Saunders has less definite sori and is without paraphyses 

 but provided with hairs. The California!! species seems to belong in 

 Asperococcaeeae because of its superficial and projecting zoosporangia, 

 and because of its general structure and appearance ought to be placed 

 near to Asperoeoccus compressus Griff. We have seen no gametangia 

 on the plants of any of our species, but judging from the statements 

 of Buff ham (1891), Sauvageau (1895), and Kuckuck (1899), the 

 gametophyte may be very much reduced, a tendency toward, but by 

 no means approximating, the microscopic gametophyte known to occur 

 in some of the other Melanophyceae. 



Key to the Genera 



1. Fronds ligulate, solid 18. Halorhipis (p. 523) 



1. Fronds cylindrical or more or less spherical, hollow 2 



2. Fronds cylindrical or slightly clavate, more or less twisted 



20. Myelophycus (p. 527) 



2. Fronds spherical, sessile 19. Soranthera (p. 525) 



18. Halorhipis Saunders 



Fronds solid, ligulate, arising from a disk-shaped holdfast, differen- 

 tiated into two fairly distinct tissues, a medulla of several layers of 

 larger, nearly colorless, closely united, more or less cylindrical cells 

 extending lengthwise of the frond, and surrounding this a cortical or 

 surface tissue composed of more or less cuboidal, color bearing cells ; 

 zoosporangia superficial among hairs and collected into minute sori 

 scattered abundantly over both sides of the frond except toward the 

 base ; gametangia unknown. 



Saunders, Phyc. Mem., 1898, p. 160. 



Halorhipis was proposed by Saunders to receive a single species 

 found at Pebble Beach, Monterey County, California. The genus is 

 closely related to Haloglossum Kuetz. 



The genus Haloglossum was founded by Kuetzing (1843, p. 340) 

 based upon the material of Asperoeoccus compressus Griffiths (in 

 Hooker, 1833, p. 278) from the southern shores of England. He 



