Copenhagen Central Station: the last time I was here was 2011 when the Icelandic volcano grounded flights and everyone was making their way home overland. The platform was crowded with people, many clutching H&M carrier bags because we’d all run out of clean undies.

This summer has turned our rivers into an "all inclusive resort" where algae can sunbath on river beds and generally enjoy life. They are not necessarily a homogeneous mass, and this post describes the variation I found in one river in northern England: bit.ly/4g8dLs1

Reflections on why #Vaucheria mats proliferate in some types of British river in my latest post:
bit.ly/3JaKela

More speculation about the life of a shade-loving diatom in my latest post: bit.ly/41TbPhO

Just found my 1980s version of ggplot …

Here's a puzzle: a Eunotia that has many small discoid chloroplasts, rather than the two plates that the (limited) literature on live diatom identification tells us to watch out for. bit.ly/3Rd2qLH

The Cyanobacterium (blue-green alga) Rivularia