158 Journal of the Mitchell Society [June 



in tlie usual sense, but firml\' waxy. Fibers of the flesh slender and 

 regular, about 1.5-2^ thick, sparingly branched. 



Spores oval, flattened on one side, yellowish under microscope, 

 very variable in size, (i.3-9 x 7.7-12.2/i,, sprouting into threads b}' one 

 or two germ tubes, which may arise at any point. Basidia oval, 13.7- 

 14.4 X l(i.3/x, irregularly four-celled, collapsed soon after formation of 

 spores. Sterigmata much thickened upward, some very long and 

 slender. Paraphyses slender, densely packed, curved over and mostly 

 branched a little at the ends, the branches crooked and more slender 

 and set with very minute crj'stals. Much larger, roughly' globular or 

 angular crystals with slender, spine-like hyaline projections also 

 occur rather abundantly through the hymenium ; they are mostly 

 about 7-9/x thick. 



This species is markedly distinct from all others we have seen. 

 The peculiar color, pustulate, anastomosing form, plump spores and 

 large crystals separate it easil.y from our other Sebacinas. The pro- 

 jections on the crystals do not seem to be of the same nature as the 

 crystals themselves and after drying reappear very obscurely if at 

 all. They ma^' be the stubs of hyphae that took part in the formation 

 of the crystals. So thicklj^ interwoven are the tips of the paraphyses 

 and so dense the little crystals that there is formed a distinct and 

 darker crust over the surface. We place this in Sebacina rather than 

 Tremella because of the waxy texture, abundant, branched paraphyses 

 and abundant crystals. Exidia is excluded by the plump spores. 



4116. On underside of old, hard heart of an oak branch, on ground, west of 

 athletic field, February 13, 1920. 



3. Sebacina. sp. ? 



Plate 60 



Plant forming a thin, extended membrane about 150/x thick which 

 is nearly smooth or obscurely nodulated and eloselj' adherent to the 

 wood, the margin quite indefinite; surface dull, color a pallid milky 

 slate with a faint tint of lavender or flesh ; texture waxy ; threads of 

 context closely packed. 



Spores (of No. 4118, print) white, smooth, elliptic, 3.5-4 x 5.5-8.5/x. 

 Basidia four-celled, 7.4^ thick, ovate, situated near the surface (in 

 some cases nearer than shown in the drawing). Paraphyses not highly 

 specialized or branched, covered with crystals through the upper layer, 

 parallel, upright and closely packed. 



