Guardian Nature School Team Contact Blog Project Noah Facebook Project Noah Twitter

A worldwide community photographing and learning about wildlife

Join Project Noah!
nature school apple icon

Project Noah Nature School visit nature school

Tar Spot Fungus

Rhytisma punctatum


Common on maples, especially bigleaf maples, like the one in the pictures in my garden. urban or forest.


Around mid-August islands of small black spots (structures that will produce sexual spores the following spring) surrounded by yellowish tissue develop on the living leaves. Later in fall when the leaves have turned golden and mostly fallen, the "tar spots" can be seen surrounded by a circle of green tissue that remains photosynthetic long after ihe leaves have fallen to the ground. The fungus overwinters in the dead leaf and, in the spring, releases spores that are transported by the winds to infect new young leaves.

Species ID Suggestions

Sign in to suggest organism ID

No Comments

Spotted by

Maple Ridge, British Columbia, Canada

Spotted on Nov 7, 2011
Submitted on Nov 8, 2011

Related Spottings

Tar spot Tar spot fungus Tar spot Tar spot

Nearby Spottings

Multicolored Asian Lady beetle White club Unknown mushroom Inky Cap or Alcohol Cap
Noah Guardians
Noah Sponsors
join Project Noah Team

Join the Project Noah Team