270 THE MYXOMYCETES 



third to one-half the total height, pale brown or yellow; hypothallus 

 none; capillitium loose, freely expanding, not deciduous, honey yellow, 

 the threads generally wide, 4-5 n, toward the periphery more narrow, 

 2.5 n, warted, marked with blunt spinules, which not infrequently 

 pass into distinct transverse, narrow plates or half-rings, free ends 

 clavate and numerous; spore-mass yellow; spores by transmitted 

 light smooth, granular, globose, 7-9 fx. 



This species as represented by the material before us seems constant 

 in size, color and microscopic characters, in all of which it differs 

 from other species here listed. It resembles somewhat Lachnoholus 

 globosus, but differs in habit, habitat, color, attachment of capillitium 

 and mode of dehiscence. In the present species the wall is almost 

 completely evanescent; in L. globosus it is remarkably persistent, and 

 the capillitium is adherent. 



Not rare, but rather infrequently collected. Its smallness removes 

 it from sight of all but the most exact collectors. Maine to Florida, 

 Missouri, Ontario, California; Europe, South Africa, Japan. 



While usually remotely gregarious, a collection from southern Cali- 

 fornia shows that on occasion the entire plasmodium may pass to 

 fruit with narrowest limits, forming a stipitate, compact, globose 

 mass of crowded, superimposed sporangia as in Oligonema nitens. 



10. Arcyria annulifera Ton end 



Fl. Myx. 102. 1909. 



Sporangia subglobose, stalked, 0.5-0.6 mm. in diameter, scattered, 

 buff yellow; calyculus membranous, concolorous, papillose, rather 

 deep with an irregular margin, plicate below; stalk concolorous, 0.2- 

 0.4 mm. high, filled with spore-like cells; capillitium scarcely elastic, 

 of very slender threads, 1-1.5 /* in diameter, bearing prominent annular 

 thickenings at intervals of 1-2 /x, the basal threads somewhat thicker 

 with moniliform swellings; spores pale yellow, with a few scattered 

 warts, 6-7 /x. 



Outwardly resembling a large A. pomiformis, but with a wholly 

 different capillitium. 



Rare. Known only from a single collection in Portugal. 



11. Arcyria glauca Lister 



in Minakata, Bot. Mag. Tok. 22 : 322. 1908. 



Sporangia ovoid or cylindrical, stalked, 0.4-2.5 mm. tall and 0.4- 

 0.8 mm. broad when expanded, pale bluish green; calyculus funnel- 

 shaped, membranous, somewhat plaited, faintly reticulate; stalk pale 



