« ft< l LLATOBIA< ] !>1 



Bcriptions, in reading over which one is tempted to believe 



thai the thirty-two might well he reduced at Lead one- 

 half. 



CI. 8CHIZ0THEEL 



355. C rcaa wellii (CresswelTs Schieothrix) ; forming 

 pull inate, convei tufts ; filament 



tigiate, collected into branching bundled, Uarv. Phyc. JJri/. 

 pi. L60. Atlas, PL LXXV. Fig. 355.) 

 I t-i sandstone maritime rock.-, near high-water ma 

 - .1 to tin- drip of fresh- water. Annual. Winter. 

 In habit this plant bears considerable resemblance to 

 one of tiie Larger Bpecies <>f Rivularia, especially to 

 of the fresh-water kinds, or those that inhabit dripping 

 rocks, localities very similar to what our Schizothrix de- 

 lights in. Hut the nature of its filaments, the absence i 1' 

 the basal globule, ami of the firm gelatinous matrix, afford 



sufficient characters to separate it from any of the Rivu- 

 li grows at the very top of high-water mark, in 

 situations V< here it is exposed to the continual drip of fresh- 

 water falling from high mural cliffs, and is most luxuriant: 

 where the drip falls from the greatest height, an Inch in the 

 station observed by Air. Cresswell, the Ticket B ck, > ; .d- 

 mouth, is about fifty feet. In this locality, where only this 

 curious plant has yet been found, it occurs in considerable 

 quantity, extending for upwards of twenty yards along the 

 surface of a projecting piece of the cliff. It coi 



Late in the autumn, and is in perfection in Noi ember. 



CII. CALOTHBIX. 



o5G. confervicola (7' Calothrix) \ filaments short, 



glaucous, opaque, filiform, blunt, rigid, straight or Blightly 

 curved, tufted, Ag. Syrt.Alg.p. 70. (Atlas, PI. LXXV. 



Leibleinia confervicola, Endl. L. purpurea, chalybea, et eeru- 

 < ►scUlatoria confervicola, Ag* Conferva 

 fervicola, TH Ilto. 

 JJ'th. On BmaU AJgse, between tide-marks; verj common. 

 Annual. Summer and autumn. 

 Very abundant on the smaller Algae toward- the end i^i' 

 summer, especially on Ceramium rubrum, whose fronds 

 are sometimes completely bidden beneath the <i« use, dark- 

 green pile formed by this parasite. Such - have 

 \ hat the habit of a CladosUphus, so densely 



