It's curious to see such skinny sterigmata topped with sub-globose spores. This arrangement- the circle of spores - presumably gives it its epiphet diademiferum, with a diadem being a royal crown, though you would imagine that could apply to any Sistotrema or Botryobasidium. Sistotrema "bunch of grapes" isn't so catchy.
(It has just now been pointed out to me that botryo refers to a bunch of grapes though in reference to the bunched basidia - thanks SB)
|Thin fb on a twig|
|sub-globose spores c.4x3.5|
|Bunch of grapes, or "diadem"|
|Scattered hymenial elements|