17G CRYPTONEMIACE^. v. 



/. Ag. Sp. Alg. 2, p. 273. Haw. Phyc. t. 199- Mastoearpus mamillosus, Kiitz. Sp. 

 Alg.p. 733. 



Hab. Newfoundland, Agardh. Penobscot Bay, Dr. Aaron Young ! Newbury- 

 port, Massachusetts, Capt. Pike ! Unalaschka, Lutke! California, Dr. Coulter ! 

 (v. V.) 



Frond three to six inches high, either regularly or very irregularly dichotomous. 

 flattish, channelled on one side, convex on the other, the segments more or less 

 broadly wedge-shaped, simple or forked, the primary ones in the old specimens 

 throwing out, in a proliferous manner from their sui'face, numerous similar wedge- 

 shaped, channelled simple or forked secondary segments. Margin of the frond 

 incurved, either quite entire and simple, or fringed with small lobes. The surface 

 of all the segments, primary and secondary, especially on the concave side, is very 

 frequently densely set with lobules, or filiform or mamilliform processes of various 

 lengths, some mere tubercles, others linear-wedge-shaped froudlets from a quarter 

 to half an inch long. In these the roundish or ovate conceptacles are lodged. 

 Colour a very dark purple. Substance rigid, somewhat horny when dry. It does 

 not adhere to paper. 



The specimens from Unalaschka are broader and shorter than those from Cali- 

 fornia. I have not seen any from Newfoundland. 



4. GiGAETiNA microphjlla, Harv. ; frond foliaceous, flat, lanceolate, mostly sim- 

 ple (occasionally bifid or trifid), attenuated to the base into a long, slender, lineari- 

 cuneate stipe ; both sui'faces very densely echinate with minute spindle-shaped 

 soriferous papillas, and the margin fringed with similar processes. Rhodymenia ? 

 inicrophylla, Harv. in Beech. Voy. p. 164. Mastoearpus Harvey anus, Kiitz. Sp. Alg. 

 p. 734. (Tab. XXVIII. A.) 



Hab. Monterey, California, Douglas ! Coulter ! (v. s. in Herb. T. C. D.) 



Root expanded, fleshy, composed of many confluent discs. Fronds tufted ; the 

 stipes at first cylindrical, as thick as a sparrow's quill, soon flattened, gradually 

 widening upwards for two or three inches ; then either forked or trifid, or simply 

 passing into the base of a linear-lanceolate leaf-like lamina, twelve or fourteen inches 

 long or more, an inch or an inch and half wide, and gradually fining off" to an acute 

 point. Both surfaces of the lamina are densely clothed with minute, subulate or 

 spindle-shaped processes ; and the margin is also closely fringed with similar ones, 

 which are sometimes lengthened out into marginal lobes from half an inch to an 

 inch in length, and fringed and muricated like the primary leaf In fertile speci- 

 mens the papilla3 are incrassated. Sori one or more in each papilla, immersed, 

 globose, consisting of moniliform strings of cruciate tetraspores. I have not seen 

 conceptacles. Substance cartilaginous, thinner than in G. Radula. Colour a deep, 

 brownish red. 



