4 Seasons, 100 Mushrooms – For years, I have wandered through Groningen’s City Park with my eyes fixed on the ground. I immer myself in magical world of dog’s vomit, wood ear fungi, candlesnuff fungi and other mysterious creatures that seem to appear out of nowhere. The park never disappoints me.
I had alreay been documenting my observations, when I learned of the Park’s centenary. This inpired me to draw 100 species of mushrooms and slime molds an publish themn as a book. I crated the drawings in line with the changing seasons. It is an ode to mushrooms and slime molds, and to their wondrous forms and behaviours.
This book is not just about the park and my city; it could be any park in any city. In places where you least expect it, live proves to be incredibly diverse. Wilderness is everywhere – even in the city – when you have the eyes to see it.
I draw the fungi I spot in the park. Working with love and dedication, in rhytm with the seasons, I just reveal how magically beautiful and biodiverse urban nature can be.

This book was made possible thanks to the support of many donors – both via the foundation FortheArt (Voordekunst) and contributions from Fund NME, the Dutch Mycological Society (NMV), Foundation K.P. Boon and the Municipality of Groningen.
I feel connected to the women in history who studied fungi and made drawings and watercolors of them. Male scientists saw the world of fungi as unimportant, which is why there were relatively many female mycologists.
The book is educational, artistic, playful, and above all, beautiful! @uitgeverijblinuet (Palmslag) has published it in july 2026.
Design: @aircocaravan.bsky.social
Would yo like to purchase the book? From the Netherlands, you can use the Webshop in the Dutch part and order it directly. From abroad, please send a mail with your order to geertjegeertsma@gmail.com . As you can see in my webshop, you can also order a small book with 43 of ther drawings on true scale – of 3 x 3 cm. This is probably the smallest mushroom book around.
