17-09-2025 10:50
Heather MerryleesHi there!I am hoping for any advice on the identif
11-09-2025 16:57
Jason Karakehian
Our revision of Marthamycetales (Leotiomycetes) is
16-09-2025 12:53
Philippe PELLICIERPézizes de 1-4 mm, brun grisâtres, sur les capsu
03-09-2025 12:44
Enrique Rubio
Hi to somebody.I would like to know your opinion o
15-09-2025 14:40
Nicolas VAN VOOREN
Hello.I'm searching for a digital copy of the seco
14-09-2025 22:16
Philippe PELLICIERApothécies petites jusquà 3 mm, oranges, avec de
13-09-2025 14:01
Thomas Flammerdark brown apothecia, splitIKI-Spores biguttulate
10-09-2025 17:18
Blasco Rafael
Hola, encontre este estiercol de vaca estos apotec
13-09-2025 14:10
Wim de GrootWe found this hymenoscyphus on rubus fruticulosis.
10-09-2025 23:53
Marcel Heyligen
Found on Robinia pseudoacasia together with Diapor
Growing on Acer macrophyllum (bigleaf maple). Seen at the Yuba Watershed Fungus Fair.No asci observed. Many parathyses with tiny oil drops were seen, they measured 30 – 45 × 2 – 3 micrometers. Many clavate basidia-like things seen, however they never had sterigmata or spores inside. Those measured (28) 36 – 47 x (5) 7 – 8 micrometers.
That is probably Rhytisma punctatum. The US host-index lists it on Acer macrophyllum in California, Oregon and Washington. The "clavate, basidia-like things" are probably immature asci. These would be mature in the spring at about the time the new leaves are emerging on the tree.
Dave
Here are some more macro images... http://mushroomobserver.org/156379?q=1higi?
Edit: I understand that punctuate dots like this on Acer macrophyllum = R. punctatum, but there is another species with a somewhat similar appearence on other maples.
http://www.glfc.forestry.ca/VLF/ForumPresentations/hsiangtarspot_08e.pdf