92 Rhodora [April 



escape of the protoplasts as naked akinetes. These at first retain the 

 shape they had when enclosed in the walls, but in a few hours round 

 off and begin to increase in size. On germination, which takes place 

 without any resting period, they produce short monosiphonous fila- 

 ments (fig. 2, b, e, d). These become flat thalli, one cell in thickness, 

 by cell-division in two planes. 



Specimens of this alga, which was kindly identified by Mr. F. S. 

 Collins, were prepared for distribution in the Phycotheca Boreali- 

 Americana of Collins, Holden and Setchell. — I. F. LEWIS. 



II. Chamaesiphon incrustans Grun. 



Chamaesiphon incrtutatu was found growing in great abundance on 

 the leaves of Fontinalis sp. collected from a pond on Cuttyhunk 

 Island. The leaves were found to be encrusted with Colrochaete 

 tcutata and occasional small plants of Bulbochaete. The Chamae- 

 siphon appeared either in patches or scattered all over the surface of 

 the Fontinalis leaves, in some eases running over the Coleoehaete. 

 This species probably has a very wide distribution, but has not hitherto 

 been recorded from Massachusetts. Specimens were preserved for 

 distribution in the Phycotheca.— I. F. LEWIS and EL II. COLLET. 



III. COMPSOPOGON COERFLKIS (Balbis) Mont. 



Large floating masses of a species of Compsopogon were found in 

 the summer of 1<>14 in the water garden on Mr. Charles Ft Crane's 

 estate by Dr. G. R. Lyman. In structure, size, and method of 

 maero-aplanospore formation the species agrees with the description 

 of Compaopogon coendeus (Balbis) Mont. The normal habitat of 

 this species is given ■ as Florida, the Antilles, and Algeria, Its pres- 

 ence as far north as Woods Hole is probably due to its introduction 

 with water-plants sent from Florida. While vigorous and abundant 

 in 1914, the species has not been found this season. It may have been 

 winter-killed, or perhaps crowded out by a large species of Cladophora 

 which has spread over the bottom of the pond. — R. H. Colley. 



» Thuxter, It. Note on the structure and reproduction of Compsopogon. Dot. Gazette, 

 Vol. 29, p. 259, 1900. 



Vol. 18, no. 207, including pages 53 to 72 and plates 118 and 119, was issued 



28 March, 1916. 



