LYNGBYA. 297 



Syn. Calothrlx lanata, Kg. 5 I/yngbya discolor, Krypt. Badens. 

 Plate CC, figs. 4, 5, after specimen from Mt. Mansfield, Vt. 



LYNGBYA MAJUSCULA, Harv. 



A marine plant, densely intricate, crisp ; trichomes rigid, 

 flexuously curved, frequently interrupted, dull olivaceous 

 or pale steel-color 5 sheath close, articulations 6-8 to diam- 

 eter. Sheath distinctly lamellate in older plants. 



Diameter of filaments, including sheath, 30-38 yu. 



Collected in the vicinity of the City of New York, but it 

 has a wide range. 



Plate CC, figs. 9-10, New York specimens. 



LYNGBYA WOLLEI, Farlow. 



Forms smaller or larger tufts attached to river stones ; the 

 more sluggish the water the larger the extent of the growth, 

 even to masses yards in diameter and a foot or more in 

 thickness. Usually brownish black ; but when older some- 

 what faded, more olive or brown or yellowish. . Articulation 

 primarily about 4 to diameter, after division 6-8. Sheath 

 firm, and lamellate in older forms. 



Diameter of filaments variable, from 40-4^w to 50-60 yw. 



Widely distributed from Massachusetts to Florida, and 

 westward to Minnesota. The largest masses occurred to 

 personal observation, in ponds, New Jersey. In one in- 

 stance in pond near Stanhope, the floating mass was fully 

 ten yards long, 2-3 yards wide, a foot or more in thickness, 

 and so densely matted, it was impossible to break through 

 with a row-boat. 



Plate CC, figs. 6, 7, 8, fragments of filaments which were 

 a foot, more or less, in length. 



LYNGBYA VERMICULARIS, (Kg. ) Eab. 



A marine plant, forming extended floating mucose strata 

 on ponds filled by the flow of high tides. Color dull or 

 dingy tea green, or olivaceous ; often faded. Trichomes 

 very unequal in size, flexuously curved, often vermicular, 

 pale aeruginous. Articulations of smaller filaments, 2-4, 

 of larger forms, 6-8 to diameter. Sheaths very thin, not 

 lamellate, often gelatinous, colorless. 



Diameter with sheath, very variable in the same cluster, 

 13-32 //. 



This is a distinct form in the disparity of sizes, some more 

 than twice as thick as others ; in the gelatinous strata, 

 and in the thin and close sheaths. 



