THE FLOEA OF NEBRASKA. 35 



Family— OH YTRIDI ACE AE. * 



"Mycelium lacking, or developed in the form of delicate protoplasm-threads, more 

 seldom clearly hyphae-like, unicellular. Sporangiophores wanting or but poorly de- 

 veloped. Sporangia always forming swarm spores, thin walled and quickly ripening, or 

 thick walled and resting for a period (resting sporangia). Sexual spore formation only 

 developed in a few forms; difference between antherid and oogone scarcely marked." 

 (Schroeter). 



This group contains about 35 genera and 160 species of minute, microscopic fungi, 

 which are almost all parasites. They are found parasitic chiefly on algae, but also 

 on flowering plants, fungi, and some lower animals (worms). They seem to be closely 

 allied to the algae of the Protococcoideae, to which the simpler forms have many striking 

 resemblances. 



The family is divided into 6 sub-families, of which we have as yet found represen- 

 tatives of but 1 in the state. 



Sub-fam. — ISyncliytrieae. — ■ Swarmsporangia formed by simultaneous division, 

 united into a sorus or arranged in a row. Restingsporangia formed 

 directly from the whole fruiting body, or by division, producing a sorus 

 of restingsporangia. 



1. SYXCHYTRHTM DeBary & Woronin Bericht. d. Naturf. Ges. Friburg. III. 

 (Ex Fischer). 1863. 



Parasites in the epidermal cells of flowering plants forming galls. Sori of 

 swarmsporangia (summer sori) formed directly from the vegetative body, 

 surrounded by the colorless membrane of the mother-cell, consisting of 

 a number of close laid sporangia which by pressure are polygonal; 

 swarmspores globular, one ciliate; resting spores round or elliptical, 

 with a thick brown exospore. 



Etymology: Greek cm, together, and x VT P^i pot. 



JSynchytrinm fulgens Schroeter. Hedwigia XII., 141. 1873. 



Spots minute, purple; galls small, orange red; sori bright yellow, spherical or 

 elliptical, produced singly in the epidermal cells which they completely 

 fill, 60-100 fi in diam.; resting spores spherical, with a smooth, thick, 

 brown exospore, 66-82 fi. 



On leaves of Oenothera biennis. Not uncommon. 



SSynchytrium peckii (Thuemen). 



Uredo aecidioides Peck. 24th Rep. 88, 1870. Not U. aecidioides DC. FI. Fr. II., 236, 



(1815) =Melampsora aecidioides Schroeter. 

 Uredo peckii Thuemen Mycotheca Universalis no. 538. 1876. 

 S. fulgens decipiens Farlow Bull. Buss. Inst. II. 229. 1878. 

 S. decipiens Farlow Bot. Gaz. 1885, p. 240. 



Spots bright yellow, galls hemispherical, sori spherical, bright yellow, 180- 

 200^ in diam.; sporangia very numerous, 15 /* in diam.; resting spores un- 

 known. 

 On leaves of Falcata comosa, Lincoln. PI. XV., Fig. 1, a. b. 



Order 4. — 4^^y «¥ T T 4icj 4.T AE .— Unicellular or fl lam an tons, p.hlosof ^ll-RT ^^r^r.r 

 p.nlnrlftssr nrnna.ga T Tii in i V ii | i-aaILdw iMii | j ; Jup roduct ion by the union of sim- 

 ilar cellsjigogaeietes^ 



* By Roscoe Pound. 



