THE FLORA OF NEBRASKA. 



53 



Entomoplithora grylli Pres. 1. c. 



E. calopteni Bessey Am. Nat. XVII, 1280 and 1286. 1883. 

 Resting spores spherical, colorless, 30-45 fi. 

 On grasshoppers. — Melanoplus differentialis, M. bivittatus, and M. femur- 



rubrum; very common in autumn. PI. XV., Fig. 3, a, b. 

 The affected grasshoppers climb to the tops of weeds and die there attached 



to the stem. They are readily known by their tight and rigid grasp, due 



to contraction of the limbs. 

 According to Thaxter, E. calopteni is not distinct from the European E. grylli 



which is found on crickets. 



Order 5. — S^PHOJfEAE. — Typically unicellular, chlorophyll-green or colorless, 



form (sometimes branched), saccate, or foliaceous, one to plurinucJeate ; 



chloSoplasts disk-shaped, parie^J propagation by cell- divisions/or by 



zoogonVlia; reproduction either heterogametic or isogametic. 



SYNOPSIS. 



Fam. — Vauclieriaceae.— terrestrial or aquatic; thallus filiform, elongated, often 

 branched; reproduction by antherids and oogones borne» laterally on the 

 filament; propagation by zoospores, zoospores large/ arising from an 

 apical inflation of the ^lament. 



Fam. — Hydrogastraceae.— Terrestrial; thallus a globose o/pyriform cell attached 

 to the earth by branching, Opaline rhizoids; reproduction by copulation 

 of zoogonidia. 



Fam. — Saprolegniaceae.— Aquatic fungf^nostly saprophytes, rarely parasites; 

 asexual reproduction chiefly by biS^liate/zoospores arising in zoospor- 

 angia; sexual reproduction by oogon\§/and antherids generally borne 

 upon short lateral branches. 



Fam. — Peronosporaceae. — Fungi growing parasitictfcUy in the subdermal tissues 

 of flowering plants, piercing the ceil walls by n^eans of haustoria; asexual 

 reproduction by conidia; sexual/reproduction D^ oogones and antherids 

 borne laterally upon mycelial/filaments. 



Family.— VAJETCHERIACEAE. 



Apparently unicellular, filiform, terrestrial or aquatic, chlorophy\l-green; forming 

 elongated, tubular filaments,simple or pseudo-dichotomously branched,orten attached to 

 substratum at base by hyaline rhizoids; propagation by motile or non-moti\ cells formed 

 in apical inflations; reproduction/by antherids and oogones, usually on the sanae filament; 

 oogones lateral, sessile, or bornyon a more or less elongated, simple or branched pedicel, 

 cytoplasm converted into a lapge oospore; antherids lateral, sessile, or cut off by\septum 

 from the upper portion of/a lateral branch, producing antherozoids internally^hich, 

 being emitted, penetrate fene apex of the oogone; antherozoids oblong, furnishedNyith 

 two unequal cilia. 



1. VAUCHERL4 DC. in Vauch. Hist. Confer. 25. 1803. V 



The characters of the family; chloroplasts minute, numerous, parietal; nuclei 

 fobose, numerous, small; protoplasm containing numerous oil globules. 

 Etymology: dedicated to the phycologist Vaucher. 



