Phaeocryptopus gaeumannii (Swiss needle cast) attacking douglas fir needles.
Images 1, 3 and 4 show transversal cuts through the douglas fir needle showing the Swiss cast (black) in the stomatae on the underside of the needle.
Images 2, 6, 7, 8 show a ventral view of the needle either with reflected light (image 2) or transmited light (*mages 6-8).
Image 5 shows a squash of one perithecium with some spores.
Images 9-13 show the symptoms on the 2 years old needles
In the "Butterfly Meadow" I'm working on at Lincoln. Documenting a bit more of the biodiversity in this little open area where more butterflies, bees, birds, and bugs are invited!