— 181 — 
97. H. dissiliens Bréb. in Ralfs Brit. Desm. 1848, p. 51, t.I, f. 1. 
Lat. 16--18y; diam. zygosp. 19—22 yw. 
In stagnant water in riverbed among various species of Spirogyra, 
with zygospores. 
Area: Ubiquitous. 
Ord. Protococcacee. 
Fam. Palmellacez. 
Coelastrum Nag. 
98. (€. sphericum Nag. Gatt. einzell. Alg. 1849, p.98, t.V, fC 1. 
In stagnant water in the jungle. 
Area: Europe, N. and S. America, W. Indies, Madagascar, India, Sumatra, 
Siberia, New Zealand. 
99. €. pulehrum Schmidle in Bericht. d. d. Botan. Gesellsch. Bd. X, 
1892, p. 206, t. XI, f. 1. 
Var. intermedium Bohlin in Bih. till K. Sv. Vet.-Akad. Hand]. Bd. 23, 
no.,7, 1897, p. 35, t. Il, f. 16, 17. 
In stagnant water in the riverbed. 
Area (of type): Europe, S. America, Ceylon, Queensland. 
Pediastrum Meyen. 
100. P. duplex Meyen. P. pertusum Kiitz. P. Napoleonis Ralfs 
Brit. Desm. p. 184, t. XXXI, f. 7. 
With the preceding species abundant. 
Area: General in temperate and tropical regions. 
Var. elathratum A. Br. Alg. Unicell. p. 93. 
With the typical form. 
101. P. Tetras (Ehrenb.) Ralfs in Ann. Mag. Nat. Hist. XIV, 1844, 
p. 469, t. XU, f.4. Micrasterias Tetras Ehrenb. 1838. 
With the preceding species and very abundant. Coenobia of 4, 1+7 and 
5 +11 cells. 
Area: Ubiquitous. 
Scenedesmus Meyen. 
102. §. bijugatus (Turp.) Kiitz. Syn. Diat. 1333, p.607. Achnan- 
thes bijuga Turp. 
Abundant in stagnant water in the jungle and in muddy ricefields. 
Area: Ubiquitous. 
103. S. denticulatus Lagerh. in Ofvers. af K. Vet.-Akad. Férh. 1882, 
no. 2, p. 61, t. Il, f. 13—16. 
