88 ENDOSPOKELE. [CHONDRIODERMA. 



wrinkled and irregularly reticulated, brownish-yellow ; the inner 

 colourless; the large columella is filled with crystalline deposits 

 of lime. 



Hob. On fallen branches of Opuntia. Algiers (Durieu). 

 This description applies to a dark form of C. testaceum. 



22. C. Stahlii Host., Mon., p. 185. Sporangia spherical, slightly 

 flattened at the base, either dull, brownish -white, or shining arid 

 dull brown ; dehiscing either by a round central opening, or by 

 an oblong fissure, or irregularly ; stalk brown, shining ; columella 

 entirely wanting ; capillitium of dull violet threads 1'2 to 2'3 p 

 thick, at first simple, branching several times towards the tips, 

 but not uniting into a net ; spores pale violet, faintly waited, 

 9 '2 /A diam. 



Hob. Near Strassburg (Dr. Stahl). 



This description suggests a form of C. radiatum, in which the 

 columella varies in shape and size. 



23. C. leptotrichum Racib., in Rozpr. Mat.-Przyr. Akad. 

 Krak., xii., p. 75 (1884). Sporangia vein-like, or irregular, 

 flattened ; sporangium-wall simple, covered with small calcareous 

 scales ; columella none ; capillitium of delicate threads 0'83 ^ 

 diam., forming a flaccid dense net, which can easily be drawn out 

 of the plasrnodiocarp ; spores blackish-brown, 12 - 5 to 13 '2 ^ 

 diam., minutely warted. 



Hob. Near Cracow, Poland. 



The scaly wall of this species suggests that it may be a plasmodiocarp 

 form of Didymium squamulosum. 



24. C. exiguum Racib., in Hedw., xxviii., p. 118 (1889). 

 Sporangia minute, stipitate, 0'3 to 0'4 mm. diam., hemispherical, 

 flattened beneath, grey, iridescent ; stalk once or twice the height 

 of the sporangium, very slender, furrowed, narrower and curved 

 above, yellow, without deposits of lime ; sporangium- wall simple, 

 with little lime, persistent and yellow beneath, hyaline and 

 breaking irregularly above ; capillitium of slender hyaline threads 

 0-4 fj, wide, branched and anastomosing, expanded at the axils, 

 but without lime deposits ; spores violet, minutely warted, 7 to 8 //, 

 diam. Resembling certain species of Tilmadoche, of which it may 

 be a form with little lime. 



Hal). On bark. Near Cracow. 



The description applies to Pkysarum nutans v. violascens. 



25. C. simplex Schroeter, Krypt. Fl. Schles., in., p. 123 (1885). 

 Sporangia globose, somewhat depressed, solitary ; sporangium- 

 wall simple, brittle, bright chocolate-brown ; columella wanting ; 

 capillitium radiating, repeatedly branched, violet ; spores violet, 

 smooth, 7 to 9 //, diam. 



Hal). On old stumps. Fiirstenstein, Silesia. 



