228 Rhodora [NovEMBER 
P. plantaginea (Roth) Grev. 817, 922, 928, 935 =P. B.-A. 81, 
1073, 1089, 1105, 1237, 1247. Seaside Park, on stones and Fucus, 
just below low water. Apr. May. 
Scytosiphon lomentarius (Lyng.) J. Ag. 819, 918, 1072, 1088, 1246 
= P. B.-A. 323a. Seaside Park, on stones. Apr., May. 
S. lomentarius forma complanatus Rosenv. 917, 1080, 1085, 1087 
— P. B.- A. 174, 1176, 1178, 1238, 1243, 1489, 1509. Seaside Park, 
on Zostera. Mar., Apr. “May s, The narrow compressed Scyto- 
siphon (1087, 1095, etc.) becoming passé. Occasional old fronds of 
it floating on the surface, inflated." 
Phyllitis fascia (Fl. Dan.) Kütz. 230, 537, 546, 547, 758, 802, 813, 
929, 1068, 1090, 1272, 1344. Seaside Park; Cook’s Point; on 
stones, mussels, and Spartina stumps. Nov.—June. 
P. fascia var. caespitosa (Ag.) Farlow. 293, 294, 302, 305, 896. 
With the type. Apr., Nov. 
Asperococcus echinatus (Mert.) Grev. 1253.  Diminutive form 
growing on Zostera with Desmotrichum, Halothrix, etc. Seaside 
Park. May. 
Stictyosiphon subsimplex Holden. 1342, 1365, 1366, 1368, 1462, 
1465 =P. B.-A. 630. Cook’s Point, in muddy marshy pools. 
Nov., May, June. “Noted fronds of lengths up to 54 inches.” 
Desmarestia aculeata (L.) Lamour. 1491. Seaside Park, Apr. 
D. viridis (Fl. Dan.) Lamour. 295, 299, 306, 313, 323, 568, 573» 
783, 911, 916, 921, 923, 926, 927, 1084, 1094, 1098, 1179, 1180, 
1239, 1240, 1350, 1362, 1484. Seaside Park. March-May. 
Dictyosiphon feniculaceus var. Americanus Collins. 304, 312, 814, 
820, 937, 1114, 1496, 1506. On Phyllitis and Scytosiphon; Cook's 
Point, in marsh pools; Seaside Park; Black Rock. Apr.-June. 
Elachista fucicola (Velley) Fries. 38, 586. Stratford Shoal; Sea- 
side Park. May, June. 
Hulothrix lumbricalis (Kütz.) Reinke. 315, 328, 533, 569, 587, 
1096, 1103, 1251. Seaside Park, on Zostera. Dec., Apr., May. 
Castagnea virescens (Carm.) Thuret. rior. On Zostera, Seaside 
Park. May. 
Myriactis pulvinata var. minor Farlow. 865. On Sargassum, Sea- 
side Park. Aug. “Apparently rather young. Only plurilocular 
sporangia ; filaments up to 25 p broad, but generally 10-18 y." 
Leathesia difformis (L.) Aresch. 320, 327, 1112, 1116, 1502. On 
Zostera, Seaside Park; Cook's Point; Charles Island. May. 
