118 A Monograph of the Myxogastres. 



dehiscing irregularly; capillitium well developed, forming an 

 irregular, loose network, threads 2 4 n* thick, irregularly 

 notched; spores globose, smooth, 13 14 /u diameter; mass of 

 capillitium and spores dingy ochraceous, sometimes with a 

 suggestion of olive. 



(Type in Herb., Kew.) 



Exsicc. Ellis, N. Amer. Fung., n. 726 (as Ophiotheca umbrina, 

 Berk.). 



On wood, leaves, &c. Britain (Lyme Regis, Yatton) ; U. 

 States. 



Berkeley's description of Opkiotheca umbrina is very imperfect, 

 as shown by examination of his type specimen, which proves 

 to be identical with Physarum vermiculare, Sz. Rostafinski had 

 not seen Berkeley's type, but gave the original description and 

 changed the name to* Perichaena varidbilis, Rost. Berkeley's 

 imperfect description of Ophiotheca umbrina curiously agrees in 

 many points with the present species which was unknown 

 to him. Rarely with simple, normal sporangia, usually elon- 

 gated and curved, forming rings, flexuous vein-like strands, or 

 combined to form a network. The species is a connecting link 

 between Perichaena and Ophiotheca, having the capillitium of 

 the former without distinct markings, but the peculiar habit 

 of Ophiotheca. 



Perichaena li ceo ides, Rost. 



Sporangia globose, scattered or gregarious, dehiscing in an 

 irregularly circumscissile manner; spores smooth, globose, 9 10 

 /* diameter ; capillitium scanty, threads slender, branched, with 

 minute included granules. 



Pcrichaena liccoides, Rost., Mon., p. 295 ; Sacc., Syll., vol. vii., 

 part I., n. 1438. 



Licea pannorum, Cienk., Pringsh. Jahrb., vol. in., p. 407, 

 t. 17, fig. 1 (not of Wallr.). 



On leaves. Germany. 



Doubtful species. 

 Perichaena pallida, Berl. 

 Sporangia gregarious, very pale tan colour; spores yellow, 



