84 CORALLINACE.E. v 



tacles urn-sliaped, formed from the axillary articulation of tlie uppermost branches 

 (mostly two-horned), furnished with an apical pore, and containing in the base of 

 the cavity a tuft of erect, pyriform or club-shaped, at length four-parted spore- 

 threads. 



This genus scarcely differs from Corallma. The species are generally smaller 

 and more slender, and those of North America are dichotomous, at least in the 

 main divisions, and therefore easily known from the pinnated Corallines. Many 

 of the Australian species of Ja?iia, comprising the section Hallptilon, are however 

 decompound pinnate. 



1. Jania rubens, Lamour. ; frond dichotomous, fastigiate, setaceous ; articulations 

 of the principal branches and ramuli cylindrical, about four times as long as broad. 

 Harv. Phyc. Brit. t. 252. Kiltz. Sp. Alg. p. 709. 



Hab. At Key West, W. H. H. (v. v.) 



Fronds half an inch to an inch high, densely tufted, many times forked, as thick 

 as hog's bristles ;• branches erect or spreading, gradually tapering to the extremities. 

 Articulations cylindrical in all parts of the frond ; those near the base very short, 

 the upper ones gradually longer ; those in the middle region from four to five 

 times as long as broad. Colour a pale red. 



2. Jania Cubensis^ Mont.; frond dichotomous, fastigiate, setaceous, the branches 

 naked or pinnated with short, simple or forked, opposite ramuli ; articulations of 

 the lower branches subcylindrical, of the upper cuneate with rounded shoulders, of 

 the ramuli cylindrical, three or four times as long as broad. Kiitz. Sp. Alg. p. 709- 



Hab. Parasitical on Digenia simplex, and other Algae, at Key West, W. H. H.., 

 Prof. Titomey (71)- 



Tufts dense, an inch in height, fastigiate, often spreading widely. Fronds as 

 thick as hog's bristle, dichotomously divided, the branches patent or sometimes 

 recurved, either destitute of ramuli (■■■hen the plant is hardly to be known 

 from J. rubens) or pinnellated throughout wiiV. short ramuli, one or two lines in 

 length. Ramidi distichous, or three together, simple a.^d spinelike or forked, some- 

 times trifurcate and now and then lengthened and pinnellated Articulations in the 

 lower part subcylindrical, the upper ones more cuneate. Colour a dull red. 



My specimens seem to agree very closely with a small authentic specin^'^.n kindly 

 communicated to me by Dr. Montague. 



3. Jania capillacea ; minute, dichotomous, capillary, Avith wide axils ; branches 



