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Specimen number RSA309355
Determination Wolffiella oblonga
More information: Jepson Online Interchange
Collector, number, date Wayne P. Armstrong, 1139, 1983-6-3
Verbatim date 1983-06-03
County San Luis Obispo
Locality Black Lake Canyon-- marsh on east side of Highway 1, 3.1 miles south of junction with Valley Road (approx. 4 miles south of Arroyo Grande)
Elevation 9m
HabitatFreshwater marsh plant community.
Coordinates 35.05840 -120.59500 BerkeleyMapper [or without layers, here]
DatumWGS84; ER = 500 m
Coordinate sourceGoogle Earth (copied from RSA309353)
Voucher information
other label numbers58e5f8df-7c59-43e2-9536-05fd62ed96ab
verbatim elevation30
NotesAbundant below water surface-- with Lemna valdiviana, Wolffiella lingulata, Azolla filiculoides, and Hydrocotyle ranunculoides.According to E. Landolt both Woffiella oblonga and W. lingulata are present in the marsh samples from Black Lake Canyon. The fronds of W. lingulata are generally larger and broader than W. oblonga. Fronds of W. oblonga are generally narrower and the angle of budding pouch is 45-60 degrees. Under unfavorable conditions both spp. may be practically indistinguishable. Ideally both spp. should be cultured and observed under controlled conditions to be absolutely certain of their identification. At this time Dr. Landolt and myself are reasonably certain that both spp. occur in Calif. (see photos). Aseptic cultures under controlled conditions should determine if there are strict differences between the two spp. or if transitional forms exist. According to Dr. Landolt, both spp. were once widespread in Calif. but have been declining during the past 50 years due to urbanization, pollution, etc. Wolffiella oblonga appears to be especially threatened. Wolffiella appears to be very sensitive to environmental changes, unlike other spp. of Lemna, Spirodela, and Wolffia in Calif. It certainly does not survive as well in my experience in growing members of the Lemnaceae in Calif. One or both spp. should probably be included on the CNPS Rare and Endangered Inventory. More research and more extensive collections are needed.;
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