11 



lated to Mesogloia gracilis Kg., Tab. Phyc, vili., PI. X, which 

 is retained in Mesogloia by Agardh. In Alg. Am. Bor. Exs., 

 No. 163, the resemblance to Mesogloia decipiens, Suringar, of 

 Japan was noted and, although I have not been able to examine 

 specimens of that species, judging by Suringar's plate,* it still 

 seems to me quite possible that the Japanese and Californian 

 plants may be the same. 



DiCTYOSIPHON MaCOUNIL n. SO.. PL LXXXVIT. fia t. 



Fronds with an undivided axis, cylindrical-saccate, 2 to 6 inches 



long, 5^ to 3^ inch in diam., tapering at the base, densely 

 clothed throughout with subequal, hollow, fusiform or clavate 



branches, i^ to I inch long, about yi inch in diam. Superfi- 

 cial cells small, 7 jx aver., irregularly polygonal, unilocu- 

 lar sporangia spherical, 38 to 42 // in diam., scattered irregu- 

 larly through the substance of the frond, not papillate at the 

 surface. 



Grande Vallee River, Gaspe, Quebec, Prof. J, Macoun, Nos. 

 16, 17, 34- 



This species is coarser and stouter than any others of the 

 genus, and the habit in well developed specimens reminds one of 

 large specimens of Chordaria abietina, Rupr. In all the speci- 

 mens in w^hich the base was well preserved the fronds were at- 

 tached to Chordaria Jlagelliformis, apparently a favorite habitat 

 of species of this genus. The younger plants from one to two 

 inches long were destitute of branches and, in this stage, might 

 be mistaken for small specimens of Scytosiphon lomoitaritis. The 

 habit when fully grown is well shown in PI. LXXXVII, fig. I, 

 and the species is not likely to be mistaken for any other Dicty- 

 osiphon of our coast, for none of them, however much they may 

 vary in size and general appearance, have the inflated axis and 

 short, subequal branches of the present plant, which is less gela- 

 tinous than most other species, and in drying does not adhere 



well to paper. 



ECTOCARPUS TOMENTOSOIDES, n. sp., PI. LXXXVII, fig. 4. 



Pulvinately expanded, filaments y^ inch long, densely inter- 

 woven, sparingly and irregularly branched, 6 to 8 /4 in 

 diam., cells short, rarely twice as long as broad. Tricho- 



*Mus^e But. de Leide, i, PL XXV. 



