[Vor. 4 
298 ANNALS OF THE MISSOURI BOTANICAL GARDEN 
Genus NopULARIA Mertens 
Nodularia spumigena Mertens var. genuina Bornet & Fla- 
hault, Ann. d. Sei. Nat., Bot. VII. 7:245. 1888. The most 
abundant and widely distributed of the Myxophyceae found. 
Occurring in practically all towings, sometimes almost assum- 
ing the character of a **water-bloom."' 
Family ScyrTONEMACEAE 
Genus тогүротнвіх Kuetzing 
Tolypothrix lanata (Desvaux) Wartmann in Rabenhorst, 
Die Algen Sachsens No. 768. 1858. Found in two collections 
growing with other algae attached to twigs near shore. 
Family RivurLARIACEAE 
Genus CALOTHRIX Agardh 
Calothrix Braunii Bornet & Flahault, Ann. d. Sci. Nat., 
Bot. VII. 3:368. 1886. Collected but once, growing on a 
single large boulder. 
Calothrix parietina (Naegeli) Thuret, Ann. d. Sci. Nat., 
Bot. VI. 1: 381. 1875. Slightly incrusted, forming brownish 
patches on small stones near shore. 
Genus GLOETRICHIA J. С. Agardh 
Gloetrichia natans (Hedwig) Rabenhorst, Deutschl. Krypto- 
gamen-fl. 90. 1847. Several large masses in one towing. 
Class CHLOROPHYCEAE! 
Order CONJUGALES 
Family MESOCARPACEAE 
Genus Moucrotia Agardh 
Mougeotia sp. Found near shore in three collections. The 
cells were normal and in good condition, but there was no in- 
1 The classification of the Chlorophyceae follows that given by Collins in 
‘The Green Algae of North America,’ as it is desirable in a list of this sort to 
adhere to some established standard. Since the appearance of Collins’s work there 
have been several fundamental changes in the position of genera and families as 
designated by him, but no confusion can arise from the arrangement here used. 
