Juncus Dudleyi 

 Juncus nodosus 



Spartina Michauxiana 

 Stachys palustris 



To these should be added Echinocystis lohata, Rihes floridum 

 and Sambucus canadensis of moist thickets and borders, and 

 Elifmus rohustiis of moist prairie borders. 



11 — THE PLANTS OF SWAMPS, LAKES, ETC. 



As has been noted the variety of hydrophytic conditions pre- 

 sented in this region makes it of especial interest. The hydrophy- 

 tic flora varies from that of the plankton and the deep waters of 

 the lakes to that of the moist forest or prairie border. This flora 

 has not been fully investigated, and much work remains to be 

 done, particularly on the plankton and in zonal studies. The 

 writer expected to complete an account of the diatoms of this 

 region for this report, but this was not possible, and the exten- 

 sive collections taken at all depths will form the basis of a later 

 supplementary report. The algag also need much more extensive 

 study. 



The principal groups of plants are represented as follows : 



Fungi. — ■ The fungi of this group, so far as observed, are all parasitic 

 marsh species, and their habitats are determined by those of their host 

 plants. The most complete list of these species was published by Arthur. n 

 The locality is given as Dickinson county. The portion of the list from 

 this locality follows: 



Uromyces acuminatus Arth., on Spartina Michauxiana. 



Puccinia caricis (Schum.) Rab., on Car ex stricta, C. adusta, and C. 

 straminea. 



Uropyxis amorphge (Curt.) Schkr., on AmorpJia fruticosa. 

 ^cidium impatientis Schw., on Impatiens pallida; also on I. l)iflora by 

 Giddings. 



Puccinia phragmites (Schw.) Koern., on PJiragmites communis. 



Puccinia arundinariae Schw., on Spartina Michauxiana. 



Puccinia polygoni Pers., on Polygonum Hartwrightii and P. Muhlenhergii. 



Puccinia angustata Peck, on Scirpus atrovirens. 



Puccinia eleocharis Arth., on Eleocharis intermedia. 



Puccinia calthae Link, on Caltha palustris. 



Puccinia tenue Schw., on Eupatorium purpureunt. 



Hume also reportedis the following: 



Ustilago Arthuri Hume, on Glyceria grandis. 



11 Bulletin of the Iowa Agricultural College, 1884. 



12 See Bibliography. 



Subkingdom I. — THALLOPHYTA 



41 



