530 Vniversity of California Publications in Botany [Vol. 8 



matophores ; color dark olive brown ; zoosporan^ia and gametangia 

 scattered or aggregated into more or less transversely arranged groups. 



Port Clarence, Golofin Bay and Unalaska Bay, Alaska. 



Reinke, Algenfl. westl. Ostsee, 1889a., p. 55, Atlas, 1889, p. 47, pis. 

 31, 32; Collins, Holden and Setchell, Phyc. Bor.-Amer. (Exsicc), no. 

 987. Phloeospora tortilis Setchell and Gardner, Alg. N.W. Amer., 

 1903, p. 245. Scytosiplion tortilis Ruprecht, Tange, 1851, p. 373. 



The plants of Bering Sea appear to belong in the form cycle of 

 this Arctic species. We seem to remember having seen specimens 

 from farther south along our coast, but cannot definitely place them. 



FAMILY 10. SCYTOSIPHONACEAE foslie 



Fronds cylindrical and hollow, flattened and solid, or more or less 

 globular and hollow, main growth in length at first trichothallic, later 

 intercalarj% simple, of two or three tissues, one of internal hyphae in 

 Endarachne, but of large colorless cells in others, second, an inter- 

 mediate layer of large colorless cells, surrounded by an outer layer 

 of small, mostly cuboidal, colored cells in longer or shorter anticlinal 

 rows ; zoosporangia unknown ; gametangia in extended and confluent 

 sori of indefinite outline, palisade-like, of equal length and closely 

 packed together, not projecting beyond the surface ; hairs in groups ; 

 unicellular paraphyses ( ?) present in some species. 



Foslie, List Mar. Alg. Isle of Wight, 1892, p. 13. Scytosiphoneae 

 Thuret, in Le Jolis, Liste des alg. mar. de Cherb., 1863, pp. 14 and 67. 



Thuret seems to have been the first to have stabilized the genus 

 ScytosipJion and to have recognized it as the type of a group cor- 

 responding to a family. Foslie, so far as we may learn, first used the 

 family ending as now usually adopted. 



The Scytosiphonaceae are close to the several preceding families as 

 has been noted previously. The method of growth is very similar, but 

 only the g-ametangia are known in the genera attributed to this family 

 and they are in expanded and indefinite sori which do not project 

 above the surface of the frond nor are they associated with pluri- 

 cellular paraphyses. The Punctariaceae possess the simplest members 

 of this series and they have both zoosporangia and gametangia, these 

 commonly produced on the same individual. In the Asperococcaceae, 

 gametangial plants are rarely found and are smaller than the zoo- 

 sporangial plants. In the Striariaceae both zoosporangial and game- 

 tangial plants are found. While in the Scytosiphonaceae, although 

 most of the species are common and widespread, no zoosporangial 

 plants have been detected. 



