196 CALIFORNIA ACADEMY OF SCIENCES. [Proc. 3D Ser. 



7. Fronds monoecious 8 



Fronds apparently dioecious 10 



8. Sixteen antherozoids in each antheridium P. amplissima 



Eight antherozoids in each antheridium 9 



9. Fronds 25/jt thick, except at base P. tenuisshna 



Fronds 30-75/^1 thick P. ntiniata f. cuneiforniis 



ID. Fronds ioo-22o,a thick P. variegata 



Fronds 45-75M thick P. occidentalis 



IT. Fronds 25/^ thick P. abyssicola 



I. Porphyra laciniata (Light/.) Ag, 



Systema Algarum, p. 190, 1824. 



Porphyra laciniata (Lightf.) C. A. Agardh, Systema Algarum, p. 190, 

 1824; Icones Algarum Europaearum. Tab. XXVII, 1828. Harvey, 

 British Marine Algse, p. 216, 1849. Janczewski, Etudes Anat. sur les 

 Porphyra, p. 352, 1873. Bornet et Thuret, Etudes Phycologiques, 

 p. 58, 1878. J. G. Agardh, Till Algern. Systematik., VI, p. 67, 1882. 

 Farlow, Marine Algae of New England, p. iii, 1881. Hus, Zoe, 

 Vol. V, p. 62, 1900. 



Utva laciniata Agardh, Species Algarum, p. 404, 1822. 



Porphyra vulgaris Harvey, Phyc. Brit., PI. CCXI. fig. i, 1851. 



Wildemania ? lacitiiata de Toni, Sylloge Algarum, Vol. IV, p. 20, 1897. 



Fronds membranous, 10-80 cm. long, 5-30 cm. broad, linear when young, 

 becoming lanceolate or broadly expanded and much laciniate when older; 

 base obtuse to cordate; sessile on disc; gray-purple; monostromatic, vegeta- 

 tive part of frond 30-45/Ji thick, cells square with rounded angles or higher 

 than broad, surface jelly 7-8,a thick; dioecious, sometimes monoecious, sporo- 

 carps and antheridia forming a marginal zone, 8 (or 16) carpospores in each 

 sporocarp, 64 (or 128) antherozoids in each antheridium. 



The author has, up to this time, been unable to find any 

 data in regard to the size this plant attains, but has received 

 the impression from the writings of others, as well as from 

 an examination of specimens, both American and European, 

 that 30 centimeters is the average length attained by the 

 fronds of this species, which suspicion was confirmed by 

 the study of a number of specimens of our western coast. 

 But recently there have come to our notice two specimens 

 from Orca, Alaska, one of which measured 60 centimeters, 

 while the other was 80 centimeters long, with a breadth of 

 30 centimeters. But such specimens do not indicate the 

 size the species normally attains ; a length of 30 centimeters 

 and a breadth of 10-15 centimeters represent the average 

 measurement. 



