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Johnson-Groh, C. 1997. Field surveys for Botrychium gallicomontanum and phenology of Botrychium mormo in Minnesota. Final report submitted to the Minnesota Dept. of Natural Resources. 14 pp.


Ecological studies of Botrychium were conducted by the author during the 1996-1997 field season. This included conducting field searches for B. gallicomontanum, monitoring the phenology of B. mormo and annual monitoring of permanent B. mormo plots.

Field surveys for B. gallicomontanum were conducted in June of 1997 for the purpose of establishing additional sites for this rare species. Sites were selected in accordance with personnel from the Minnesota DNR. Three sites, two in Kittson County and one in Marshall County were searched. Botrychium campestre was found in both counties and represents new county records and sizable range extensions in Minnesota. Previously the northernmost location was Lincoln County. Botrychium lunaria, also a new county record was discovered at Lake Bronson State Park and also represents a range extension for this species. B. matricariifolium, also a county record, was found in Kittson County.

Four species of moonworts were found at Lake Bronson State Park including: B. simplex, B. campestre, B. lunaria and a fourth undetermined species. The fourth species may be B. gallicomontanum or related species, B. spathulatum or B. pallidum. Any of these species would represent significant finds for Minnesota and identification will be confirmed through isozyme analysis. All plants were yellowed and deformed due to the application of a herbicide earlier in the year.

The phenology of Botrychium mormo was monitored at two sites in the Chippewa National Forest every two weeks from June through September 1996. A total of 284 plants were monitored. Plants emerged earlier (June 2) than previously suggested and the population size likewise peaked earlier than previously hypothesized (July 14). The largest plants occurred late in August with an average size of 2.6 cm. Plants emerging early in the season had a prolonged "seasonspan," or period of emergence, whereas plants emerging later had a relatively short "seasonspan."

Annual monitoring of five permanent B. mormo plots occurred July 14-20, 1996. Population sizes increased significantly in 1996.

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