312 



USTILAGINEAE. 



gerraiiiatioii produce a thread-like promyceliuni bearing apical 

 conidia, which conjugate in pairs before emerging from the 

 host-tissues. 



The following species form conidia on the host-plant : 



Entyloma serotinum Schroet. occurs on leaves of Sympltytum tnherosurii, 

 S. officiitalix, and /lor'/f/o ojficijuih'.s. 



E. canescens Schroet. On Myosotis (Britain). 

 E. fuscum Schroet. On Fapaver Rhoeas and /'. Argemone. 

 E. bicolor Zii])f. On Papaver Rhoeas and P. duhium (Britain). 

 E. ranunculi (Bon.) foi-nis white spots on species of Ranunculus. Tufts 

 of hyphae emerge from the stomata and 

 form conidia, which on germination again 

 give off" conidia.^ (Britain.) 



E. corydalis De Bary on Corydalls 

 cava and C. solida. 



E. heloscladii Magn. on HeloscJadixm 

 nodiflorum. 



6 1 ''W^ i These do not produce conidia on 



i [r ^^. the host-plant : 



/r\ '^^ ^- thalictri Schroet. on Thalictrvm 



minus (U.S. America). 



E. verruculosum Pass, on Ranuncvlus 

 lanuginoitns. 



E. Fischeri Thiini. on Stenactis hellidi- 

 Hora. 



E. chrysosplenii (Berk, et Br.) on 

 Chrysosplenium alternifolium (Britain). 



E. linariae Schroet. on Linaria vidyaris 

 (U.S. America). 



E. picridis Rostr. on Picris hieracoides. 

 E. eryngii(('orda) on Eryngium planum 

 and E. campestre. 

 E. calendulae (Oudem.) on Calendula, Hierachim, Arnoseris, Arnica, 

 Bellidiastrmn, etc. (Britain) (Fig. 168). 



E. crastophilum Sacc. on Poa and Dactylis in Italy. 



The following produce gall-like swellings : 



E. microsporum (Ung.) {E. Ungerianum De Bary) (Britain and 

 U.S. America). On Ranunculus repens, R. Indbosus, and R. Ficaria 

 (Fig. 168). 



E. Aschersonii (Ulf) on roots of Helichrysum arenarium (Fig. 169). 



E. Magnusii (Ulf) on roots of Gnaphalium uliginosum and O. luUo-alhum 

 (Fig. 170). 



Fig. \&&.—Bntylomo. calendulae. a, My- 

 celial filament, with two yoVing resting- 

 spores. h, Resting-spore germinating ; 

 the anterior pair of primary conidia 

 shows conjugation or fusion at the base. 



Entyloma inicrosporum. c, Germinat- 

 ing resting-spore ; four primary conidia 

 fusing in pairs at their apices, d, The 

 same specimen seven hours later; com- 

 mencement of abjunction of a secondary 

 sporidium on each pair. (After De 

 Bary.) 



H. M. Ward, Philofiopli. transactions of Royal Soc. London, Vol, ITS, 1889. 



