130 A Monograph of the Myxoyastres. 



Prototrichia chamaeleontina, Mass. 



Sporangia spherical or spherico-depressed, attached by a 

 narrow base, wall very thin, highly iridescent, dehiscing irregu- 

 larly; capillitiuni well-developed, threads thick at the point 

 of attachment, tapering upwards, often nodulose, without external 

 markings, breaking up into several free, pointed spines that 

 are sometimes connected by transverse bands, dingy brown ; spores 

 pale pink, globose, minutely warted, 9 11 ju, diameter. 



Cornuvia metallica, Host., Mon. App., p. 35 ; Cooke, Myx. 

 Brit., p. 76 ; Sacc., Syll., n. 



Physarum metallicum, Berk., Mag. Zool. and Bot., No. 29, 

 t. 3, f. 8; Cooke, Myx. Brit, p. 16. 



(Type in Herb. Berk., Kew.) 



On twigs, bark, dead leaves, &c. Britain (Clifton, Notts; 

 Carlisle, Smethwick). 



Scattered or in groups of 2 3, about 1 mm. diameter. 

 Sporangial wall very iridescent, reflecting green or rosy tints, 

 mass of spores pinkish or flesh-colour. The previous existence 

 of a species of Prototrichia called metallica, accounts for the 

 change of name in the present species. 



OPHIOTHECA, Curr. (emended). 



Sporangia sessile with single or double wall, frequently con- 

 taining amorphous particles of lime, either regular, circular, or 

 depressed, with circumscissile dehiscence, or aethalioid, or form- 

 ing a vein-like, anastomosing plasmodiocarp ; capillitium form- 

 ing a loose network, attached to the wall at various points, 

 and usually with free arms, threads with spines, warts, or short 

 bands irregularly scattered ; spores globose. 



Ophiotheca, Currey, Quart. Joura.- Micr. Science, vol. ii., 

 p. 240. 



Pcrichaena, Host., Mon., p. 292; Cke., Brit. Myx., p. 77; 

 Sacc., Syll., vii., 1, p. 420 (all in part). 



Cornuvia, Host., Mon., p. 289 ; Cke., Brit. Myx., p. 76 ; Sacc., 

 Syll., vii., 1, p. 423 (in part). 



