V. CERAMIACE^. 2.39 



Hab. Prince Edward's Island, Dr. Jeans. Halifax, W. H. H. Boston, Mrs. Asa 

 Gi^ay. Lynn, Mrs. Mwlge. Portsmouth, Dr. Durkee. New Bedford, Dr. Roche. 

 New York Bay, Mr. Hooper, (v. v.) 



Filaments three to four inches long, capillary, densely tufted, much and finely 

 branched, alternately decompound ; the lower divisions sub-distant, the upper close 

 together, all rather patent, the secondary branches elongate, the tertiary and suc- 

 ceeding short. Every part of the filament is pellucidly articulate, without veins. 

 Each articulation bears a pair of very slender, byssoid, opposite ramuli one to two 

 lines long, very patent and oppositely pinnate or bi-pinnate ; the pinnules some- 

 times abortive or abbreviated, when the branching becomes irregularly alternate or 

 sub-secund. Apices attenuate, acute. Articulations in the lower part of the stem 

 and branches many times longer than broad, in the lesser branches five or six 

 times, in the ramuli frequently six or eight times, but sometimes only four or five 

 times as long as broad. Tetraspores sessile, near the base of the pinnte on the 

 ramuli, elliptical, cruciate. Favellai near the ends of the lesser branches, large, 

 berry-like, in pairs or threes. Colour, a brilliant, rosy red. Substance, very flaccid 

 and delicate. It closely adheres to paper in drying. 



A very beautiful species, not uncommon on the East Coast of North America 

 from Nova Scotia to New York. 



Plate XXXVI. A. Fig. 1. G ajaatr amnion A mericanum ; the natural size. Fig. 



2, part of a larger branch, with lateral branches, aud pinnate, opposite ramuli ; Jig. 



3, part of a branch with favellie ; fig. 4, the same -with tetraspores ; fig. 5, a fertile, 

 lower pinna from the preceding ; the latter figures more or less highly magnified. 



13. CALLiTHAjraiON Pylaiscei, Mont. ; filaments elongate, ultra-capillary, alter- 

 nately decompound ; branches distant, erecto-patent ; ramuli in pairs, opposite at 

 every node, pinnate or bi-pinnate, the pinna3 opposite or rarely secund ; lower arti- 

 culations of the stem many times longer than broad, upper two to four times ; arti- 

 culations of the ramuli once or twice as long as broad ; tetraspores elliptical, sessile 

 on the ramuli, cruciate. Mont. Ann. des Sc. Nat. 2nd Ser. vol. Vm. p. 3.51. Wran- 

 gelia Pylaiscei, J. Ag. Sp. Alg. 2, p. 705. Callith. intermedium, Harv. MSS. (Tab. 

 XXXVI. B.) 



Hab. Newfoundland, De la Pylaie ! South Boston, Dr. Durkee! (v. s. in Herb. 

 T. C. D.) 



Filaments three to four inches, rather thicker than human hair, alternately four 

 or five times decompound, the lower branches distant, the upper gradually nearer ; 

 every part pellucidly articulate. From a short distance below each node of the 

 stem and branches springs a pair of opposite ramuli about half a line in length, 

 some of them simply pinnate, some few secundly pectinate, but the greater number 

 bi-pinnate, ovate in outline, all the pinnules tapering to an acute point. Lower 



