206 RN'DOSPOREAE [TRICHIA 



A. Spores more or less completely reticulated : — 



Elaters 7 to 8 /a wide ; spores reticulated ; border 2 fx wide ; 

 sporangia sessile. 1. T.favoginea 



Elaters 4 to 5 fx wide ; spores reticulated with narrow bands ; 

 border 1 /x wide ; sporangia stalked, clustered. 



2. T. verrucosa 



Elaters 4 to 6 lc wide ; spores reticulated with broad pitted 

 bands ; border 0*5 to 1 ^ wide ; sporangia sessile. 



3. T. aflinis 



Elaters 4 to 6 jx wide ; spores with the reticulation more or 

 less broken into irregular shallow pitted warts ; border 

 interruj)ted, 0-5 [x wide ; sporangia sessile. 



4. T. persimilis 



Elaters 4 to 6 /x wide ; spores very closely reticulated ; 

 border none ; sporangia sessile. 5. T. scabra 



B. Spores minutely warted (sometimes minutely reticulated 



in T. decipiens) : — 



a. Spirals of elaters two. 6. T. varia 



b. Spirals of elaters three or more — 



a. Elaters shortly tapering at the ends — 



Sporangia sessile ; wall uniformly thickened with 

 granular matter ; spirals of elaters distinct or 

 faint. 7. T. contorta 



Sporangia sessile ; wall without granular thickening ; 

 spirals of elaters faint. 8. T. lutescens 



Sporangia stalked ; wall membranous, thickened in 

 rounded areas with brown granular deposits ; elaters 

 spinose. 9. T. erecta 



Sporangia stalked ; elaters smooth. 12. T. subfusca 



(3. Elaters smooth, very gradually tapering at the ends ; 

 sporangia stalked — 



Stalk filled with spore-like cells. 



10. T. decipiens 



Stalk almost solid, not filled with spore-like cells. 



11. T. Botrytis 



1. T. favoginea Pers. in Roemer N. Mag. Bot., i. 90 (1794). 

 Plasmodium white (or yellow, fide Macbride). Sporangia sessile, 

 globose, ovoid, or clavate, crowded on a membranous hypo- 

 thallus, 0-6 to 0*7 mm. broad, 0-7 to 1-9 mm. high, ochraceous- 



