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By Mark McLean Mushrooms can appear from early spring through late fall, but August and September are typically when the greatest diversity of species is found in Muskoka’s forests. The mushrooms we see emerging from the forest floor are the fruiting bodies of fungi that live underground. The unseen part of the organism consists of a vast network of thread-like structures called hyphae, collectively known as the mycelium. Most of these mushrooms are mycorrhizal, meaning their hyphae have formed a connection with the roots of plants including trees. Through this connection, the fungus receives carbon produced by the plant through photosynthesis, while the plant gains access to essential nutrients such as phosphorus and nitrogen, which the fungus is able to break down and extract from the soil. This mutually beneficial exchange depends on one critical factor: water, which acts as the medium that allows nutrients to move between partners. From July through October of 2025, Muskoka received only a fraction of its usual precipitation, combined with periods of unusually high temperatures. As a result, plants shifted into survival mode. While older trees can often endure short-term drought, younger trees may struggle. Because mushrooms consist of up to 95% water, dry conditions dramatically reduce the ability of the fungus to form fruiting bodies. When water is scarce and plants stop sharing resources, fungi simply do not produce mushrooms. These conditions were clearly reflected during the August mushroom forays in 2025. Compared to the previous two years, approximately 60% fewer mushroom species were observed—a striking illustration of how closely fungi are tied to moisture levels and forest health. Most of the mushrooms that were found last year were growing on living or dead trees and most of those were polypores. Here are a few examples of polypore mushrooms.

Aug 18 Foray on the Bondi Resort trails, Port Cunnington It was another great foray. There was an enthusiastic group - a few returning from last year and several new people. Despite dire predictions it only rained briefly. Here's what we found: Hydnum repandum, Wood Hedgehog Sarcodon sp. Gymnopus dryophilus, Oak-loving Gymnopus Marasmius siccus, Orange pinwheeel Marasmius rotula, Collared Parachute Marasmius pulcherripes, Rosy Parachute Hymenopellis furfuracea, Beech Rooter Hygrocybe coccinea, Scarlet Waxcap Hygrocybe miniate, Vermillion Waxcap Humidicutis marginata, Orange Gilled Waxcap Ramaria botrytis, Rosso Coral Coprinopsis lagopus, Hare’s Foot Boletus sensibilis, Curry Bolete Ramaria formosa, Yellow-tipped Coral Retiboletus ornatipes, Ornate Bolete Lactarius sp. (white latex) Tricholomopsis decora, Decorated Mop Mycena leana, Orange Mycena Tremellodendron Schweinitzii, Jellied False Coral Xeromphalina Campanella, Pinewood Gingertail Cantherellus cinnibarinus, Red Chanterelle Coltricia Perennis, Brown Funnel Polypore Fomes Fomentarius, Hoof Fungus Ganoderma applanatum, Artists Shelf Entoloma Salmonium, Salmon coloured Amanita Flaviconia, Yellow Patches Craterellus ignicolor, Flame Chanterelle Boletinellus meruilioides, Ash-tree Bolete Trametes versicolor, Turkey Tails Scleroderma citrinum, Pigskin Poison Puffball Lycoperdon Marginatum, Peeling Puffball Clitocybe adirondackensis Russula Brevipes, Short-stemmed Russula Variata, Variable Russula Hygrocybe flavescens, Golden Waxcap Marasmius pulcherripes, Rosey Parachute Leotia lubrica, Jelly Babies Leotia viscosa, Chicken Lips

See the annual results for the Dr. Cathy Charles Bird Count held every spring at the Marsh's Falls Nature Reserve.

See the results for our mushroom forays held in late August and early September.

Three page impressionistic guide to the lower Oxtongue River. Stunning photos and informative text.

See the results of our July 6 butterfly count at the Marsh's Falls Nature Reserve. Exciting news - the first sighting of a Striped Hairstreak!

Learn about the Monarch's unique migration strategy, the many challenges this species faces, and what you can do around your home or cottage to help it survive.

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