THE FLORA OF NEBRASKA. 



Family. -CHYTRIDIACEAE. * 



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



seldom clearly hyphae-like, unicellular. Bporangiophorea wanting or bu1 , rly de 



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

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

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

 (Schroeter). 



This group contains about 35 genera and 1G0 species of minute, microscopic fungi, 

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

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

 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 repreeen 

 tatives of but 1 in the state. 



Sub-fam.— Synchytrieae. — Swarmsporangia formed by simult m is 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. SY^CHYTRIITM DeBary & Woronin Bericht. d. Naturf. Gea Priburg, 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 aw, together, and x VT P'C pot. 



Synchytrinm fnlgens Schroeter. Hodwigia XII, 141. L873. 



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 ft. 

 On leaves of Oenothera biennis. Not uncommon. 



Synch ytrium peckii (Tiiuemen). 



Uredo aecidioides Peck. 24thRep.88, 1870. Not U. aecidioides DO. PL Pr. II.:. 



(1815) =Melampsora aecidioides Soheoeteb. 

 Uredo peckii Thuemen Mycotheca Universalis no. 538. l s 7o. 

 S. fulgens deeipiens Farlow Bull. Buss. Inst. 1 1. 229. 1- - 

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



Spots bright yellow, galls hemispherical, son spherical, brighl yellow, I s " 

 200 [i in diam.; sporangia very numerous, 15 in diam.: rest bog spores on 

 known. 

 On leaves of Falcat a eo mosa, Lincoln. PL XV.. Pig. 1. a. 1>. 



Order 4.— COX J UGATAE.— Unicellular or filamentous, chlorophyll green or 



colorless; propagation by cell division; reproducl Lon by t be union <>f aim 



ilar cells (isogametes). 



* By Roscoe Pound. 



