recent oncoid
<dl><dd>Locality: river "Obere-Alz", <a href="https://en.wikipedia.org/wiki/de:Truchtlaching" class="extiw" title="w:de:Truchtlaching">Truchtlaching</a>, <a href="https://en.wikipedia.org/wiki/de:Bayern" class="extiw" title="w:de:Bayern">Bayern</a>, Southern Germany <br></dd>
<dd>Size: 8 x 8 x 4.5 cm<br></dd>
<dd>recent onkoid, with nucleus, covered with laminat, enveloping biofilm produced by cyanobacteria<br></dd>
<dd>on macro you see...  tubes of caddisfly larva and surface covered mit different cyanobakterias</dd></dl>
Hans Lauterbach <a href="//commons.wikimedia.org/wiki/User:Furchenstein" title="User:Furchenstein">Furchenstein</a>
CC BY 3.0
<span class="int-own-work" lang="en">Own work</span>