BOT.-VOL. II.] HUS—PORPHYRA. 225 



Locality .—^\i\Ahy Island, San Juan County, Washing- 

 ton (N. L. Gardner, No. 273rt!). 



14. Porphyra variegata Kjellm. in litt. 



Plate XXI, Fig. 18. 



Zoe, Vol. V, 1900, p. 69. 



Porphyra variegata Kjellm. in litt. 



Diploderma variegatum Kjellman, K. Sv. Vet. Akad. Handl., Bd. XXIII, 



1889, p. 33, PI. 11, figs. 1-4. 

 Wildemania variegata de Toni, Nuova Notarisia, Annata V, 1890, p. 148; 

 Sylloge Algarum, Vol. IV, 1897, p. 23. 



Fronds membranous, 10-80 cm. long, 2-20 cm. broad, obovate to lanceo- 

 late, with slightly irregular margin, slightly undulate, base cuneate to obtuse, 

 or even cordate, sessile with small disc, areolate; color rich crimson, often 

 variegated; fronds distromatic, 100-220/^ thick; cells in immediate vicinity of 

 attachment spherical or square with rounded angles, other vegetative cells 

 from 3-5 times as high as broad, 30-60/^ high, 3-30/x broad, with rounded 

 angles; surface jelly thick, 20-45//; cell-wall thick, composed of several layers 

 of jelly; fronds dicecious, sporocarps spreading over the whole frond, more 

 or less intermixed with vegetative cells; each sporocarp containing from 8 to 

 32 carpospores. 



The average length of some hundred specimens of Por- 

 phyra variegata^ collected at various localities on the Pacific 

 Coast is 20 to 25 centimeters. Several plants in our 

 herbarium fall below that mark, measuring from ten to 

 fifteen centimeters, while a few attain a length of from 

 forty to eighty centimeters. These measurements all refer 

 to dried specimens, and judging from the fact that plants of 

 this species, when soaked out, increase to about twice the 

 size of the dried specimen, it is supposed that the plants 

 contract considerably when drying; something which has 

 also been indicated by Kjellman (1889), who was able 

 to collect Porphyra variegata himself. The author was less 

 fortunate, and had to depend on dried specimens collected 

 by others. The impossibility of examining freshly gathered 

 specimens was keenly felt at first, — since specimens as soon 

 as soaked out disintegrated so rapidly as to make the prep- 

 aration of satisfactory sections out of the question. After 

 a number of experiments, it was found that if the dried 



