620 



Clark : A new Volute [.la 



200—500 // long X 2—7 ft in diameter ; sporopliorcs simple, continu- 

 ous or rarely I -septate, always cut off from the hypha by septum^ 

 30-70 ft long, tapering from 2 }i // at base to i ^^ ft at apex ; conidia 

 hyaline (when viewed singly), oblong, 2-2)^ l^^A^7!^y 2-guttate, 

 forming great masses on top of sporodochium. 



The species in man}' particulars resembles closely ]\ ciliata 

 Fr., but differs from it in several important particulars as follow : 



VolUIKII-A MKLl.KA. ' 



VOI.UTEI.LA Cn.IATA Fr. 



SporodocJiia at first white, becom- Sporodocliia albo-carneis. 



ing yellow later. 

 Stratose. 



Microspoyophorcs 30 to Jo ft x 



2 Yz // at base to 1 ]A it at apex. 



Macrosporophorcs somewhat 



larger. 



Hyaline to honey-colored. 



Microcofiidia distinctly 2-guttate. 

 J/^?'r;Y^rc';//V//V/ obscurely 2-guttate. 

 On Panda /lus. 



\ 



Sporophorcs 10 to 15 // x i /^ 



_ # 



II)'aline or dilutelv rose. 



On Dicotyledons. 



liOTANICAL nKVARTMINT, CORNFI.I. UNIVI-.RSnV. 



K^Kplaiiation of I'late 371 ' 



1. Microconidia, X 5*^*^- 



2. Macroconidia, X 5^*^- 



3. Microconidia germinating, X ^*^*^- 



4. First branching of germ Inbes. 



5. branch of mycelium bearuig macrosporopliorcs, from cultiuc in bugar beet 



•igar, X 500. 



6-9. Microsporophorcs, showing different stages in the development of a '* bead ** 



of microconidia, X S*-^^* 



10. A young sporodojhium (diagrammatic), X 250. 



11. A mature .fipomdochium, many of the spores removed, showing the stratose 

 stmcture (diagrammatic), X ^S^- 



