234 Rhodora [NovEMBER 
C. roseum (Roth) Harv. 1550. Floating, Charles Island. Apr. 
Cystocarps and tetraspores. 
C. tetragonum (With.) Ag. 1551. Floating, Charles Island, 
Apr. 
Pleonosporium Borreri (Eng. Bot.) Nag. 52, 69, 372, 390, 625, 
638, 645, 665a, 876, 1031, 1140, 1402, 1405. On muddy rocks at 
light and spindles, and at beacon, Penfield Reef; Floating, Seaside 
Park; Woodmont; Long Beach; Charles Island. July-Sept. Tetra- 
spores, Aug., Sept. 
Seirospora Griffithsiana Harv. 1030. Scooped up from rocks 
below low water, Black Rock Beacon. Aug. 
Antithamnion Americanum (Harv.) Farlow. 239, 243, 267, 301, 
559, 590, 786, 1076, 1348, 1446, 1485, 1486, 1499, 1511, 1543. Float- 
ing, Seaside Park; Woodmont; Charles Island.  Jan.-May. 
A. cruciatum (Ag.) Nàg. 469, 473, 499, 536, 614, 839, 1167. 
On algae and stones, Seaside Park; Long Beach; Woodmont. 
May- Dec. 
Rhodochorton Rothii (Eng. Bot.) Nag. 189, 256, 269. On rocks, 
Seaside Park. Nov., Feb, March.  Tetraspores, Feb., March. 
Ceramium Capri-Cornu (Reinsch) Farlow. 173, 231, 1058. 
Washed ashore on Zostera, harbor. June, Oct. “Only an autumnal 
form of C. strictum, growing on Zostera. Of this 1 am convinced.” 
C. circinatum (Kütz.) J. Ag. 637. On Fucus, Woodmont. July. 
C. fastigiatum Harv. 472, 1141. On Zostera, Long Beach. Aug., 
Sept. 
C. rubrum (Huds.) Ag. 75, 360, 371, 1483. Seaside Park; 
Woodmont. July, Aug., Jan., “ Luxuriant but sterile, on Fucus.” 
C. rubrum var. secundatum (Lyng.) Harv. 1523. TheGut. July. 
C. botryocarpum Griff. (C. rubrum var. proliferum |. Ag.) 1138, 
1475, 1522 — P. B.-A. 894, 1524, 1525, 1526, 1527. The Gut. 
July, Aug. Cystocarps and tetraspores, July. “Tetrasporic plants 
much less proliferous than the cystocarpic.” 
C. strictum (Kiitz.) Harv. 63, 71, 353, 358, 359, 363, 368, 369, 
374, 378, 411, 432, 437, 495, 858, 1139. Yellow Mill Bridge; on 
sand-covered rocks, Seaside Park; on Zostera, Cook's Point; Nor- 
walk shore. June-Aug.  Tetraspores, July. “432 passing into the 
form of C. Capri-Cornu ; curved branchlets just starting out.” 
C. tenuissimum (Lyng.) J. Ag. 468, 471. On Agardhiella, Sea- 
side Park. Sept. 
