Draparnaldia 221 



Batrachospermum glomeratum Vauch. Hist. Conferv. 114.//. 

 12. f. 1. 1803. DeCand. Flor. Franc;. 2: 59. 1815. 



Conferva Chara Roth, Cat. Bot. 3: 285. 1806. 



Conferva mutabilis Eng. Bot. pi. 174.0. 1 807. 



Draparnaldia mutabilis Bory, Ann. Mus. Hist. Nat. 12 : 402. 

 pi. Jj.f 1 b. d. 1808. 



Generally densely tufted, 1-8 cm. long; filaments repeatedly 

 branched, branches spreading or horizontal, solitary or opposite, 

 moniliform, bearing very numerous scattered, opposite, or whorled 

 fascicles of branchlets, fascicles mostly set at right angles to the 

 branch and often sessile, broadly orbicular to elliptical in outline, 

 their branchlets spreading, the rachis of the fascicle disappearing 

 in the ramification or at least not more prominent at the summit 

 than other branchlets, ultimate branchlets densely crowded, subu- 

 late, often setiferous ; cells of larger branches strongly inflated, 

 50—90 or sometimes 125// in diameter, their length about equal 

 to (Yz— 2 times) the diameter; chlorophyll band rather narrow or 

 half as broad as the diameter, proportionately broader or even 

 filling the cell in the smaller branches ; diameter of terminal 

 branchlets 6-9 // (//. 40, f. j, 4). 



Exsic: Phyc. Bor. Am. 20, Bridgeport, Conn. (I. Holden). 

 Tild. Am. Alg. 13, St. Paul, Minn., September 1894. 



Attached to grass, sticks, stones and earth, in active or quite 

 waters. 



Vermont: St. Johnsbury, April (671), July (684), October 



(649). 



Massachusetts : Melrose, April (552) ; Rowley, May (556) ; 

 Worcester, 1887 (G. E. Stone). 



Connecticut : Thomaston, May (544, 545). 



New York : Bronx Park, April (14, 80, 270, 338, 339) ; Van 

 Cortlandt Park, April (79, 342). 



New Jersey : Grantwood, Bergen county, March (4, 62), April 

 (91), May (364); Hudson Heights, March (70), April (303). 



This species is very well distinguished from D. plumosa and 

 D. acuta by its broadly rounded fascicles of branchlets, in which 

 the rachis is quickly lost in the branching. 



The forms known as D. glomerata distans (Kiitz.) Hansg., 

 and D. glomerata rcmota Rabenh. appear to be no more than 

 growth stages of the species. The description of D. glomerata 

 maxima Wood, Hist. F. W. Alg., contains no feature that dis- 



