98 MANUAL OF POISONOUS PLANTS 



produce very disagreeable odors when decomposition occurs, and this plant is 

 no exception to the rule. A few of these algae may be mentioned. 



Anabaena flos-aquae Breb. 



Anabaena stagnalis, Kg. Both of these are found floating on the water. 

 In their decomposition they produce pig-pen odors. 



EUPHYCEAE Algae 

 CHLOROPHYCEAE. 



Volvocaceae. 



Pandorina. Common in stagnant pools, especially in barnyards. The water 

 is repulsive. Cattle will not drink it unless driven to do so. May be injurious. 

 Volvox may be placed in the same category. 



EUMYCETES Fungi 

 PHYCOMYCETES. BLACK MOULDS AND DOWNY MILDEWS. 



Mucoraceae. 



The species of this family are common ; among them are : Mucor mucedo L., 

 found on horse manure. 



Mucor corymbifer F. Cohn, and Mucor rhizopodiformis F. Cohn. Both 

 species are pathogenic. 



Mucor stolonifer Ehrb. 



Common in the United States. Not pathogenic. Mouldy vegetables, etc. 



Mucor racemosus A. Fres. 



Is widely distributed in North America. Mouldy vegetables, etc. 



BASIDIOMYCETES. 



Ustilaginaceae. 



Ustilago Zeae (Beckm.) Ung. Corn smut is supposed to be poisonous to 

 cattle, but the evidence is not very conclusive. 



Ustilago avenae (Pers.) Jens. The common loose smut of oats is sup- 

 posed to be injurious in large quantities, the same may be said of other smuts 

 occurring upon cereals. Among these are barley smut Ustilago hordei, U. nuda, 

 U. tritici. 



Ustilago neglecta Niessl. 



Pigeon Grass smut is thought by many farmers in Iowa to cause poisoning, 

 especially abortion. Prof. Power, formerly of the University of Wisconsin, 

 found present in this smut a small quantity of ergotin. 



Ustilago utriculosa Tul. Smartweed Smut. 



This common smut is said to produce irritation and frequently is the cause 

 of trouble at husking time. This fungus is widely distributed in North America. 



Tilletiaceae. 



Tilletia foetens (B. & C.) Trel. 



Stinking smut of wheat is not common in this state, but when it occurs in 

 flour it causes bad odors. The spores give to the flour a dark color and make 

 it unsalable. 



Melampsoraceae. 



Coleosporium solidaginis (Schw.) Thum. 



Parasitic on golden rod and some other plants of the order. Common in 



