BULLETIN 



OF THE 



TORREY BOTANICAL CLUB 



Vol- IX.l New York, March, 1882. [No. 3 



Fresh-Water Algae. VI. 



By Francis Wolle. 

 (Plate XIII.) 



The following is a partial list of fresh-water algae collected by 

 myself and by interested contributors during the past summer (1881). 

 The addition to the recognized forms of the algae of the United 

 States is not so large as that made in some previous years ; neverthe- 

 less it indicates that our waters have not yet been fully explored. 

 More forms ought to be found ; indeed, some genera are not as yet 

 represented. Why do we find no Sphaeropleal Good forms of 

 Prasiola have not yet occurred, except from the Rocky Mountains ; 

 while less conspicuous forms, well known in Europe, are also wanting. 



GOMPHOSPHAERIA, Ktz.— G^. aponina, Ktz., var. cordi- 

 FORMis, n. var. (Plate xiii, Fig. 11). G. thalio primario laete aeruginoso, 

 deinde pallide aurantiaco, vel expallescenti ; tegumentis achromati- 

 cis, subcrassis ; cellulis numerosis, densis ; cellulis marginalibus dis- 

 tinctecordiformibus, paullo longioribus quam latioribus ; cellulis in 

 medio, a vertice visis, bicocciformibus ; cytioplasmate granulato 

 aerugineo vel expallescente. Diam. cellul. .ooo5"-.ooo6'' ; long. 



.0006 -0008 ' ; crass, .ooo3"-.ooo4 



Hab. Small ponds near Bethlehem, Penn. 



This plant differs from(?. aponina, Ktz., in the form of the cellules, 

 which are decidedly heart-shaped, not *'cuneate." The coenobia 

 and the cellules are fully twice the size of those of the only species 

 described. 



SPIRILLUM, Ehrb.— ^. undida, Ehrb. Hab. Small ponds, Penn. 



SPIRULINA, Link.— 6*. Jetineri, Hass. Hab. Ponds, Penn. 



OSCILLARIA, Boss.— a littoralis, Carm.; coll. by R. Hitchcock 

 in submarine waters, New York. O. crassissima^ Rab., in trenches, 

 Penn, O, detersa^ Stitz.; coll. by Dr. A. Seipt in a pool in Luray 

 Cave, Va,, 260 ft. below the surface. 



PHORMIDIUM, Ktz. — F. inundatum^ Ktz., on moist earth, S- 

 Car.; coll. by H. W. Ravenel. P. iinctorium, Ktz,, coll. by C, G. 

 Pringle, April, in springs, Arizona. 



CALOTHRIX, Ag. — C, gracilis^ Rab., on river stones in shallow 

 water, Penn. C affinis, Menegh., through R. Hitchcock, from 

 Sandwich Islands. 



DIMORPHOCOCCUS, A. Br.— Z>. lunatus, A. Br., New Jersey. 

 PALMODACTYLON, Naeg.— P. simplex, Naeg., coll. by R. 

 Hitchcock, in Croton water, New York, 



OOCYSTJS, Naeg.-^6>. Nae^ 

 and New Jersey. 



PEDIASTRUM, Meyen, — P. simplex, Meyen ; typical form 

 (Plate XIII, Figs, i and 1 ; two new varieties, Figs, i" and i"'.) P. 

 biradiatum, Meyen; all collected by R. Hitchcock in the New York 

 City supply of Croton water. 



