222 CERAMIACEvE. t. 



in different specimens. Fra(V of both kinds is borne along the margin, either on 

 the rachis, above the axil of the pinnules, or, very frequently, along one or both edges 

 of the pinnule itself The tetraspores are densely crowded in little pedicellate heads. 

 The favellce are likewise stalked, and surrounded by involucral pinnated ramelli. 

 Colour^ a dark brownish red. Substance^ cartilaginous. It does not adhere to paper 

 in drying. 



Discovered by Mr. Menzies on the North West Coast of America, but seemingly 

 much more common in North Eastern Asia, particularly in Kamtschatka, from which 

 country I possess several specimens. 



4. Ptilota Californica, Rupr. ; frond piano-compressed, two-edged, virgate, de- 

 compound-pinnate ; pinna3 and pinnulae opposite, unlike; one undivided denticulate 

 or serrate, the other (abortive or) pinnately parted ; pinnulae broadly sword-shaped, 

 sliglitly narrowed at base, erecto-patent, incurved, acute, more or less denticulate, 

 especially toward the apex, areolated with cells; fruits marginal, the tetraspores (?) 

 in densely paniculate, pedicellate glomeruli alternating with the pinnulae ; favellae 

 similarly placed, involucrate, the branches of the involucre entire or dentate. /3 con- 

 cinna; pinnules sharply inciso-serrate. 



Hab. North California, Wosnessenshi ! Golden Gate, Capt.Pike! Var. /3, with the 

 preceding, Capt. Pike. (v. s. in Herb. T. C. D.) 



Fronds six or eight inches long, repeatedly pinnate, the primary and secondary 

 pinna; long and virgate, the rest short, ramuliform. Branches strongly compressed, 

 half a line wide, erecto-patent, much attenuated at their insertion. Pinnulce between 

 lanceolate and sword-shaped, slightly narrowed, not the least decurrent at base, 

 incurved, acute, sometimes almost entire, but generally sharply denticulate, or un- 

 equally serrate. FavelltB pedicellate, marginal, solitary or numerous in the spaces 

 between the pinnules. Tetraspores appear to occupy the same place, but I have not 

 seen perfectly formed ones : in my specimens there are minute, paniculately branched 

 glomeruli, but whether intended for antheridia or tetraspores I have not determined. 

 Colour, dark purple-red. 



This species is very nearly allied to P. asplenioides, from which it chiefly differs 

 in the narrower, not decurrent pinnules, evidently narrowed at the base. It differs 

 from P. serrata more in its virgate habit and dark colour than by any very precise 

 characters, unless that noticed in the glomeruli of tetraspores may be constant. The 

 serratures of the pinnulae are exceedingly variable, each of Capt. Pike's specimens 

 differing in the degree of incision. 



5. Ptilota serrata, Kiitz. ; frond piano-compressed, two-edged, decompound- 

 pmnate ; pinnae and pinnulae opposite, unlike ; one undivided serrated, the other 

 (abortive or) pinnately parted ; pinnulae broadly subulate, very patent, acute, 

 sharply serrated, especially on the outer edge, areolated with cells ; fruits marginal, 



