TRICHIA.] TRICHIACE.E. 163 



Genus 33. TRICHIA Haller, Hist. Stirp. Helv., iii., p. 114 

 (1768). Sporangia stalked or sessile; sporangium-wall mem- 

 branous, sometimes charged with granular matter ; capillitium 

 yellow or brown, consisting of free elastic threads, pointed at 

 each end, and thickened with two to five spiral bands ; spores 

 reticulated, or minutely warted. 



KEY TO THE SPECIES OF TRICHIA. 



A. Spores reticulated, or marked with broken bands : 



Elaters 7 to 8 //, wide, spores reticulated, border 2 /*, wide. 



1. T.favoginea 



Elaters 4 to 5 //, wide, spores reticulated with narrow bands, 

 border 1 /x, wide, sporangia stalked. 2. T. verrucosa 



Elaters 4 to 6 ^ wide, spores reticulated with broad pitted 

 bands, border 0'5 to 1 //, wide, sporangia sessile. 



3. T. affinis 



Elaters 4 to 6 /A wide, spores with broken reticulation of 

 broad pitted bands, border 0'5 /x, wide, sporangia sessile. 



4. T. persimilis 



Elaters 4 to 6 ^ wide, spores very closely reticulated, border 

 none, sporangia sessile. 5. T. scabra 



B. Spores minutely warted : 



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 ; elaters smooth or spinulose. 



7. T. contorta 



Sporangia stalked, wall membranous, with rounded 

 areas thickened with granular deposits ; elaters 

 spinose. 8. T. erecta 



b. Elaters smooth, very gradually tapering at the ends 



Stalk hollow, filled with spore-like cells. 



9. T. fallax 



Stalk solid. 10. T. Botrytis 



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

 Plasmodium ? Sporangia globose, ovoid, or clavate, crowded, 

 sessile or shortly stalked, on a membranous hypothallus ; 0'6 

 to 0*7 mm. broad, 0'7 to 1'9 mm. high, ochraceous-yellow ; 

 mass of spores and capillitium orange-yellow ; sporangium-wall 

 membranous, minutely thickened with irregular stride. Stalk 

 membranous, rarely present. Capillitium of long cylindrical 

 elaters 7 to 8 /x diam., smooth or with scattered spines, thickened 



