IOWA ACADEMY OF SCIENCES. 
27 
The last two species of Nostoc have not been previously 
reported from Iowa. Cylindros^ermum comatum Wood 
occurs frequently at Grinnell, on w^et soil along brooks. 
The plant has not been previously reported in Iowa. 
Another Cylindrospermiimi^io\xndi]iQrQ, but the species has 
not been determined. Lynghya vulgaris (Kuetz.) Kirch., 
and Microcoleus terrestris repens Kg., both occur on damp 
soil at Grinnell, and are new to the state. Oscillaria ten- 
errima Kuetz., and Oscillaria princeps Vauch., from Fay- 
ette, and Oscillaria tenuis Ag., from Grinnell, are new to 
the Iowa flora; and Oscillaria limosa Ag., was also collected 
at Fayette. Fhormidium tenue (Menegh.) Gomont., is 
another alga frequently seen at Fayette and not previ- 
ously reported from Iowa. Also Beggiatoa alha (Vauch.) 
Trev., occurs frequently at both places, and has not been 
reported for Iowa. 
Merisrnopedia glauca (Ehrenb.) Naeg. occurs frequently 
at both places, and Gloeocapsa magma Kg. occurs frequently 
on granitic bowlders at Fayette, while Gloeocapsa arenaria 
(Hass.) Rabh. occurs abundantly in a greenhouse at Grin- 
nell. Both of the Gloeocapsas are herein reported for the 
first time in Iowa. Another species of the genus occurs at 
Fayette with Scytonema myochrous, but this has not been 
determined. 
The polymorphous Chara fragilis Desf. occurs frequently 
in small pools along the Volga river at Fayette, and has 
not been previously reported in Iowa so far as the writer 
can ascertain. 
No doubt a considerable number of the plants reported 
herein for the first time have been collected and studied 
by other workers at various times, without publishing any 
record of the work done upon them. There is a most in- 
teresting and instructive field, for one who may have time 
and inclination, in the algse of Iowa. 
In closing the writer wishes to express his thanks to 
Miss Josephine E. Tilden for aid in the determination of a 
number of difiicult species. 
