Rocklady mentioned 'stellate' in that picture? hmm..I posted something about trichomes/stellates at LB a few days ago because a forum member has reported to have seen these and posted pictures that looked similar. I also had those 'star fish' shaped specimens..looked like fiber knots..the kind you can find in hand woven carpets.
The trichomes/stellates are so called plant hairs..very tiny..and are used in pesticides 'Paraquat' for adhesive purposes.
Trichome
Trichome - Wikipedia, the free encyclopedia
Trichomes (from the Greek τρίχωμα - trikhoma meaning "growth of hair"), are fine outgrowths or appendages on plants and certain protists. These are of diverse structure and function. Examples are hairs, glandular hairs, scales, and papillae.
Certain—usually filamentous—algae, have the terminal cell produced into an elongate "hair-like" structure called a trichome. The same term is applied to such structures in some cyanobacteria.
A common type of trichome is a hair. Plant hairs may be unicellular or multicellular, branched or unbranched. Multicellular hairs may have one or several layers of cells. Branched hairs can be dendritic (tree-like), tufted, or stellate (star-shaped).
The most basic terms used are glabrous—lacking hairs— and pubescent—having hairs. Details are provided by:
glabrous, glabrate – lacking hairs or trichomes; surface smooth
hirsute – coarsely hairy
hispid – having bristly hairs
downy – having an almost wool-like covering of long hairs
pilose – pubescent with long, straight, soft, spreading or erect hairs
puberulent – minutely pubescent; having fine, short, usually curly, hairs
pubescent – bearing hairs or trichomes of any type
strigillose – minutely strigose
strigose – having straight hairs all pointing in more or less the same direction as along a margin or midrib
villosulous – minutely villous
villous – having long, soft hairs, often curved, but not matted
Star shaped Trichome, Stellate Trichome:
Kat