oligonema] trichiaceae 219 



State (B.M. 3192) ; Manchester, Mass. (Herb. Dr. Sturgis) : var: 

 flavicoma — Lyme Regis (B.M. 1475) ; Witley, Surrey (B.M. 2951) ; 

 Leighton, Beds (B.M. 2952) ; Wardour Castle, Wilts (B.M. 2953) : 

 Portugal (B.M. 2954). 



12. T. subfusca Rex in Proc. Acad. Nat. Sci. Phil., 1890, 

 192. Plasmodium ? Sporangia stalked, gregarious, solitary 

 or united in pairs, subglobose or pyriform, 05 to 09 mm. diam., 

 dull brown, yellowish- or reddish-brown ; sporangium-wall 

 membranous with dark granular deposits. Stalk brown or 

 purple-brown, stout and furrowed, separated from the cavity 

 of the sporangium by the inner layer of the sporangium-wall. 

 Capillitium consisting of bright yellow elaters, marked with 

 three to four prominent spiral bands, ending in short slender 

 often curved tips. Spores yellow, minutely spinulose, 11 to 

 13 /m diam.— Macbr. N. Am. Slime-Moulds/ 217. T. Boirytis 

 var. subfusca Lister Mycetozoa, 172. 



PL. 163. — /. sporangium ; m. elater ; n. spore; (Adirondack Mountains, New York. 

 This species is closely allied to T. Botrytis, of which perhaps it is 

 hardly more than a marked variety with the ends of the yellow elaters 

 short, not long and tapering. 



Hob. On dead wood.— Ireland (B.M. 2955) ; Norway (B.M. 2956) ; 

 Ceylon (B.M. 2957) ; Washington State (B.M. 1944) ; Adirondack 

 Mountains, New York (B.M. 1897). 



Genus 39.— OLIGONEMA Rostafinski Mon., p. 291 (1875). 

 Sporangia minute, densely clustered or heaped ; capillitium 

 usually scanty, of short or long threads., with spiral markings 

 obscure or wanting ; spores reticulated. 



KEY TO THE SPECIES OF OLIGONEMA. 



Sporangia globose, heaped together ; sporangium- wall smooth ; 

 spores irregularly reticulated. . 1.0. nitens 



Sporangia ovoid, crowded ; sporangium- wall with minute 

 granular thickenings ; spores regularly reticulated. 



2. 0. flavidum 



1. 0. nitens Rost. I.e., f. 198. Plasmodium watery-white. 

 Sporangia subglobose, sessile, heaped together for the most 

 part in large clusters, 02 to 0-4 mm. diam., shining, yellow 

 or olivaceous-yellow ; sporangium-wall membranous, yellow, 

 smooth except for scattered horseshoe-shaped thickenings en- 

 closing a thinner membrane. Capillitium of usually short, cylin- 

 drical, simple, branched, or ring-shaped yellow elaters, 3 to 5 //. 

 diam., with rounded or abruptly pointed ends, either smooth 

 or marked with one to four irregular and indistinct spiral 

 bands passing from the right above to the left below when the 

 thread is viewed horizontally, occasionally provided with ring- 

 shaped thickenings and scattered spinas. Spores yellow, 



