. The Canadian field-naturalist. Figure 1. Ascocarp of Morchella conica L., Maienthemum canadense Desf., Polygonatum piibescens (Willd.) Pursh, Pteridium aquilinwn (L.) Kuhn, and Prunus pumila L. This stand contained seedlings of P. strobus at a density of approximately 10 000 seedlings/ha. Observations Large numbers of Morchella conica (Figure 1) ascocarps were observed in the last week of May 1991 within a 30 m x 70 m plot of standing timber treated with prescribed fire in early September 1990 (Figure 2). Mushroom identification followed Pomerleau (1980). Ascocarp biomass was deter- mined at
. The Canadian field-naturalist. Figure 1. Ascocarp of Morchella conica L., Maienthemum canadense Desf., Polygonatum piibescens (Willd.) Pursh, Pteridium aquilinwn (L.) Kuhn, and Prunus pumila L. This stand contained seedlings of P. strobus at a density of approximately 10 000 seedlings/ha. Observations Large numbers of Morchella conica (Figure 1) ascocarps were observed in the last week of May 1991 within a 30 m x 70 m plot of standing timber treated with prescribed fire in early September 1990 (Figure 2). Mushroom identification followed Pomerleau (1980). Ascocarp biomass was deter- mined at 2860 kg/ha (fresh weight) and 710 kg/ha (dry weight) by sampling plots each measuring 1 m-. Ascocarps occurred in a 2-3 m radius around dead Piniis banksiana trees, but none occurred in the neighbourhood of dead P. resinosa and P. strobus trees. Morchella conica ascocarps were not observed in the surrounding unbumed forest. In eastern Canada, Morchella conica represents one of five morel species, although it is recognized that morel taxonomy is imprecise (Pomerleau 1980). Morchella conica (and related morel species) have been observed in great numbers after fire in other areas of North America (McKnight and McKnight 1987). But this is the first time the high occurrence. Figure 2. Ascocarps of Morchella conica surrounding a dead Pinus banksiana tree at the Petawawa National Forestry Institute. This stand was treated with prescribed burning the previous Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Ottawa Field-Naturalists' Club. Ottawa, Ottawa Field-Naturalists' Club
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