Classification . 169 



we liave in tlie present group a greater differentiation 

 of tlie sporophore than that met with in the genus 

 B'^hacelotheca, and accompanied by a special arrange- 

 ment for spore dissemination. Finally, Professor Mar- 

 shall Ward has shown that ^ Schinzia leguminosarum^ 

 Franks which forms hard, irregular swellings on the 

 roots of various leguminous plants, is allied to the 

 TIstilagiuGse. 



USTILAGINE^. 



Fungi for the most part parasitic in the aerial por- 

 tions of living plants ; mycelium usually widely 

 extended in the host but soon disappearing ; resting- 

 spores produced within the hyphal filaments which 

 often become gelatinous and deliquescent; gonidial 

 modes of reproduction are present in some few 

 species ; the resting-spores on germination produce a 

 slender continuous or sparsely septate promycelium 

 which bears primary sporidia at the apex or laterally, 

 the sporidia often conjugate in pairs and afterwards 

 germinate, the germ-tube either directly penetrating 

 the host, or producing secondary sporidia which infect 

 the host plant. In nutritive solutions the resting- 

 spores often produce yeast-like cells in great 



numbers. 



Analysis of the Genera, 



I. Resting-spores solitary. 



Resting-spores not aggregated in clusters. 



A. Sori not covered with an involucre formed of 



hyphse. 



t Sporidia generally produced laterally on the 



promycelium, rarely at the apex. 



fi Phil. Trans. Roy. Soc, 1887, p. §39. 



