224 Rhodora [NOVEMBER 
Rivularia atra Roth. 1220 — P. B.-A. 357b. On turf of Spartina, 
Charles Island. Sept. 
AR. nitida Ag. 651, 685, 728. On bank of outlet, Fresh Pond. 
July-Sept. 
Jsactis plana (Harv.) Thuret. 439, 726. On stones, Charles 
Island. Sept. 
Monostroma crepidinum Farlow. 761, 763, 772, 1066. Seaside 
Park, on rocks; outlet of Fresh Pond. Nov., Dec. 
M. Grevillei (Thuret) Wittr. 268, 279, 557, 794, 797, 801. Sea- 
side Park; Cook's Point. March, Apr. 
M. latissimum (Kütz.) Wittr. 14, 18, 310, 321, 333» 1244, 1353, 
1356, 1456. Fresh Pond, on Zostera, Ruppia, etc. “Fronds of all 
sizes up to nearly 2 ft. long, some over a foot wide, some small ones 
looking like M. pulchrum.” Cook's Point; Yellow Mill Pond. Apr., 
May. 
Ulva Lactuca var. rigida (Ag.) Le Jolis. 1339, 1349 =P. B.-A. 
407. On stones in pools and between tides, Seaside Park. Nov. 
U. Lactuca var. mesenteriformis (Roth) Collins. 1354, 1355. 
Washed ashore, Yellow Mill Pond. Apr. 
Enteromorpha clathrata (Roth) J. Ag. 1269. Fresh Pond. June. 
E. crinita (Roth) J. Ag. Xs, Xro, X11. On turf near high water 
mark, Seaside Park; Fresh Pond. 
E. erecta (Lyng.) J. Ag. 612. On Fucus, Woodmont. June. 
E. Hopkirkii McCalla. 692, 719, 804, 806 = P. B.-A. 463. On 
Zostera, Milford Point; Fresh Pond. Apr., Sept. “At Fresh Pond 
in April this grew to the length of 2 or 3 feet in a week, forming 
long, ropy, confervoid strings, attached at base to pebbles (and shells) 
and floating on the surface. The long, monosiphonous branches and 
elongated tips, when fresh, float in the air like spider's webs." 
E. intestinalis (L.) Link. 282, 311, 336,950. Fresh Pond; Yel- 
low Mill Pond. Mar.—June. 
E. intestinalis forma cylindracea J. Ag. X7, X9, 1257. Seaside 
Park; Yellow Mill Pond. May. 
E. Linza (L.) J. Ag. 316, 330, 821, 1359. Seaside Park. Apr., 
May. 
E. Linza var. crispata |. Ag. Xx. Brackish pond in Seaside Park. 
Apr. 
E. minima Nag. 782, 808, X3, X8, 1245, 1255 =P. B.-A. 468, 
1256, 1261. On stones and mussels near high water mark, below 
Yellow Mill Bridge; Seaside Park. Feb., May. 
