CALONEMA] r TBICHIACEAE 221 



spirals passing from the left above to the right below when 

 the thread is viewed horizontally, — that is in the reverse 

 direction to the spirals of Trichia elaters. Spores yellow, 

 12 to 13 fx, diam., regularly reticulated with narrow bands, 

 which give a border of 1 /x, and form a net showing three to five 

 meshes across the hemisphere. — Mass. Mon., 171 ; Macbr. 

 N. Am. Slime-Moulds, 220 ; Lister in Journ. Bot., xlii. 137 ; 

 Torrend Fl. Myx., 119. Perichaena flavida Peck I.e., xxvi. 

 76 (1874). 0. brevifilum Peck I.e., xxxi. 42 (1879) ; Macbr. 

 I.e., 221. 0. nitens Lister Mycetozoa, 173, in part. 



PI. 165. — a. sporangia ; b. elaters and spores with fragment of sporangium-wall ; 

 c. part of elater, and two spores ; (Sussex). 



This species is nearly allied to the preceding, but appears to be 

 constantly distinguished by the granular thickenings of the sporangium- 

 wall, the minutely warted capillitium and by the regular reticulation 

 of the spores. Among the numerous gatherings made by Mr. Hugo 

 Bilgram in Fairmount Park, Philadelphia, is one (B.M. 2966) having 

 the capillitium threads long and repeatedly branched and anastomos- 

 ing ; the spore-net is closer than usual, showing about five meshes 

 across the hemisphere. This gathering serves to prove how close is 

 the connection between 0. flavidum and Calonema aureum. The type 

 of O. brevifilum Peck appears to differ from that of O. flavidum only 

 in having fewer and shorter elaters. 



Hab. On dead wood.— Hencot, Salop ? (B.M. 2963) ; Horsham, 

 Sussex (B.M. 2964) ; Portugal (B.M. 2965) ; N. Germany (B.M. 3203) ; 

 New York (B.M. slide) ; Philadelphia (B.M. 1478) ; Iowa (B.M. 1023) ; 

 South Carolina (B.M. 964). 



Genus 40.— CALONEMA Morgan Myx. Miami Valley, 

 33 (1893). Resembling Oligonema, except that the threads 

 of the capillitium are combined to form a network. 



1. C. aureum Morgan I.e. Plasmodium ? Sporangia 

 sessile, clustered, subglobose, 0-3 to 0-6 mm. diam., 

 shining, yellow ; sporangium- wall membranous, yellow, 

 translucent, marked with delicate branched lines of thickening 

 forming an irregular net resembling fan-tracery with thinner 

 spots whence the lines of tracery radiate. Capillitium consisting 

 of branching yellow threads, 3 to 5 /x diam., more or less united 

 to form a network, and marked with raised lines, or rows of 

 minute warts, arranged to form either an irregular reticulation 

 or spirals like those on the elaters of Oligonema flavidum ; 

 ring-shaped thickenings and scattered spines usually present. 

 Spores yellow, 13 to 15 /u, diam., regularly reticulated with 

 narrow raised bands, which give a border of 1 to P 5 ^ to the 

 margin, and form a net showing five to six meshes across the 

 hemisphere.— Macbr. N. Am. Slime-Moulds, 208. Oligonema 

 flavidum var., Lister in Journ. Bot., xlii. 138. 



PI. 165. — d. sporangia ; e. capillitium and fragment of sporangium-wall ; /. capil- 

 litium and two spores ; (Ohio). 



