1905] Collins, Phycological Notes of Isaac Holden 231 
Porphyra laciniata (Lightf.) Ag. 788, 1441b. On rocks, Seaside 
Park. Mar. Young plants, Nov. 
P. leucosticta Thuret. 781, 784, 787, 791, 798, 1071, 1081, 1083, 
1242--P. B.-A. 376. On Fucus, rarely on stones, Seaside Park ; 
Cook's Point. Jan.—Apr. 
Erythrotrichia ceramicola (Lyng.) Aresch. 496, 725. With other 
algae on Zostera and Fucus, Seaside Park; Charles Island. Sept., 
Oct. 
Acrochaetium Sagraeanum (Mont.) Bornet. (Chantransia virgatula, 
in part.) 17, 646, 701=P. B.-A. 39, 708, 750, 757- On Ruppia, 
Fresh Pond. May, July—Nov. 
Nemalion multifidum (Web. & Mohr) J. Ag. 1127. On rocks near 
low water mark, Stratford Shoal. July. 
Gelidium crinale (Turn.) J. Ag. 712, 1539. Woodmont; Seaside 
Park. Sept. 
Chondrus crispus (L.) Stack. 564, 1335. Woodmont. Cysto- 
carps, Apr., Oct. : 
Phyllophora membranifolia (Good. & Woodw.) J. Ag. 1043, 13245 
1329, 1331, 1334 =P. B.-A. 379a, 1530. Dredged, Stratford Shoal; 
Penfield Reef; washed ashore, Woodmont, Aug.—Oct. Cystocarps, 
Sept., Oct. 
P. Brodiaei (Turn.) J. Ag. 1042, 1330, 1332. Dredged, Stratford 
Shoal; Penfield Reef. Oct. 
P. Traillii Holmes. 713. Sides of rocks, between tide marks, 
Woodmont. Sept. 
Ahnfeltia plicata (Turn.) Fries. 26. Long Beach. June. 
Sterrocolax decipiens Schmitz. On Añnfeltia, No. 26. 
Actinococcus subcutaneus (Lyng.) Schmitz. On Phyllophora Bro- 
diaet, No. 1042. 
Agardhiella tenera (J. Ag.) Schmitz. 176, 425, 434, 475» 493) 721, 
759, 868, 962, 965, 972, 1029, 1148, 1338, 1410, 1411 =P. B.-A. 
138, 1419. Seaside Park; Pleasure Beach; Cook's Point. July- : 
Nov. Tetraspores, Aug., Sept., Nov. 
Gracilaria multipartita (Clem.) Ag. 73, 423, 426, 682, 727, 852, 
859, 875, 1037, 1478, 1479 =P. B.-A. 634, 1535- Seaside Park; 
Cook's Point; Fresh Pond; The Gut. July-Sept.  Tetraspores, 
July. Var. angustissima Harv. much commoner than type. 
Rhodymenia palmata (L.) Grev. 566, 1222, Woodmont; Long 
Beach. Apr., Nov. 
