208 A Monograph of the Myxoyastres. 



threads often forked at acute angles, anastomosing laterally, 

 brownish-lilac, furnished here and there with thickenings ; spores 

 dusky violet, globose, with prominent, elongated, flcxuous ridges, 

 8 11 p diameter. 



" Didymium dealbatum, B. and C.," in Herb. Berk., n. 10756. 



Chond.rioderma subdictyospermum, Host., Mon. Append., p. 16; 

 Sacc., Syll., n. 1260. 



On wood, amongst moss. Venezuela. 



A very fine and distinct species, sporangium pure white, 

 polished, about '5 mm. diameter. There appears to be no good 

 reason why Berkeley's specific name, although only a manu- 

 script one, should have been changed by Rostafinski. The 

 description of the present species in Saccardo's Sylloge is 

 meaningless. 



(Rostafinski's Synonym.) 

 Didymium dealbatum, B. msc. 



Chondrioderma Friesianum, Rost. 



Sporangia sessile, subhemispherical, wall very much charged 

 with lime, snow-white, after the crust has fallen away, grey; 

 columella distinct, lenticularly depressed, yellowish-gilvous or 

 flesh-colour ; capillitium well-developed, colourless, threads com- 

 bined to form a network ; spores pale violet, 8 /x diameter, 

 smooth. 



CJwndriodcrma JSi'icsianum, in Fuckel's Sym. Myc., 2, p. 74 ; 

 Rost., Mon., p. 172; Sacc., Syll., no. 1260. 

 On bark, stems, &c. Europe. 



Distinguished from Chondrioderma globosum by its irregular 

 form, by the inside of the sporangial wall subreticulate, and 

 the almost umber spores. 







(Rostafinski's Synonyms.) 

 Diderma dijforme, Sommf., Fl. Lap., p. 217; non Pers; sed 



Fr., S. M., iii., p. 106 (1825). 



Chondrioderma Friesianum, Rost., in Fuckel's Symb. Myc., 2, 

 Nach., p. 74. 



