1905] Collins, Phycological Notes of Isaac Holden 233 
P. urceolata (Lightf.) Grev. 338, 1361, 1500, 1514, 1552. Seaside 
Park; Charles Island. Apr.—June. Tetraspores, June. 
P. urceolata var. formosa (Suhr) Ag. 242, 296, 300, 307, 562. 
Seaside Park; Woodmont. Jan., Apr. l 
P. variegata (Ag.) Zan. 70, 367, 373: 377: 386, 389, 394, 397, 4135 
424, 467, 478, 492, 635, 655, 955, 1381, 1473, 1474 =P. B.-A. 639, 
1477, 1528. Seaside Park ; Cook's Point. July-Oct. Tetraspores, 
July. 
P. violacea (Roth) Grev. 920. Seaside Park. Mar. 
Bostrychia rivularis Harv. 169, 171, 172, 174, 180, 505, 545, 684. 
Cook's Point. Jan. Aug., Oct, Nov. “Up near high water mark 
where the stalks of Salicornia and a finish kind of grass stand thick 
together, mostly in the shade of Spartina, so that when left by the 
retreating tide these beds probably never become dry; there the 
bases of these plants and sometimes the bottoms of the sheaths of 
Spartina, and occasionally a little bit of Fucus are covered with a 
fine web of Bostrychia, among which are scattered fronds of Delesseria 
Leprieurii.” 
Rhodomela subfusca forma gracilior (Harv.) J. Ag. 561. Wood- 
mont. Apr. 
Dasya elegans (Mart.) Ag. 53, 66, 229, 361, 365, 376, 385, 388, 
392, 393» 396, 401, 405, 415, 428, 466, 491, 506, 634, 654, 683, 760, 
860, 961, 964, 970, 1205, 1327, 1336, 1337, 1387, 1389, 1391, 1393, 
1395 =P. B-A. 545, 1397, 1398, 1400, 1404, 1415, 1418, 1476. 
Penfield Reef; Seaside Park; Cook's Point; Long Beach; The 
Gut ; Pleasure Beach. July-Dec. Cystocarps, tetraspores and anth- 
eridia, July. 
Grifithsia Bornetiana Farlow. 399,443, 1542. Floating, Seaside 
Park ; Stratford Point; Charles Island. Aug., Sept., Oct. “Charles 
Island, small tufts floated ashore, globose antheridia-bearing cells 
few; vegetative tapering branches and antheridial branches on the 
same frond ; rhizoidal processes very abundant.” 
Callithamnion Baileyi Harv. 238, 244, 251, 391, 538, 560, 589, 
613, 1044, 1202, 1221, 1223, 1406. Floating, Seaside Park; Wood- 
mont; Charles Island; Long Beach; covering Chondrus and other 
algae, Penfield Reef; dredged at Stratford Shoal. Jan., May-Aug., 
Oct.-Dec. 
C. byssoideum Arn, 665. Black Rock Beacon. July. 
C. corymbosum (Eng. Bot.) Ag. 690. Floating, Long Beach. 
Aug. 
