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Marsilea oligospora Goodd.  
Family: Marsileaceae
[Marsilea vestita var. oligospora (Goodd.) Dorn]
Marsilea oligospora image
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David M. Johnson in Flora of North America (vol. 2)
Plants forming dense clones. Roots arising at nodes. Petioles 3.1--5.7 cm, sparsely pubescent. Pinnae 6--15 × 5--14 mm, pilose. Sporocarp stalks erect, unbranched, attached at base of petiole, sometimes bent near apex, 5--10 mm. Sporocarps nodding, 5--6 × 3.6--4 mm, 1.5 mm thick, ovate in lateral view, covered with long straight hairs when young but eventually glabrate; raphe 0.8--1 mm, proximal tooth 0.2--0.6 mm, curved away from sporocarp, distal tooth up to 0.4 mm, broad, blunt or absent. Sori 14--20. Sporocarps produced summer--fall (Jun--Oct). Around ponds and marshes, in wet depressions in sagebrush and less commonly on river margins; 700--2400 m; Calif., Idaho, Mont., Nev., Oreg., Utah, Wash., Wyo. Marsilea oligospora recently has been resegregated from M . vestita (D. M. Johnson 1986), from which it differs consistently in its nodding sporocarps that lack a pronounced distal tooth and its pilose leaves and stems. Where their ranges overlap, M . oligospora also has longer sporocarp stalks than does M . vestita . Plants of this species were recently grown from spores 100 years old (D. M. Johnson 1985).

Marsilea oligospora
Open Interactive Map
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Kathy M. Davis, University of Florida Herbarium
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Kathy M. Davis, University of Florida Herbarium
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Kathy M. Davis, University of Florida Herbarium
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Kathy M. Davis, University of Florida Herbarium
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Kathy M. Davis, University of Florida Herbarium
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Kathy M. Davis, University of Florida Herbarium
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Kathy M. Davis, University of Florida Herbarium
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Kathy M. Davis, University of Florida Herbarium
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Kathy M. Davis, University of Florida Herbarium
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The PCC, and this data portal, were made possible by funding from the National Science Foundation’s Advancing Digitization of Biological Collections (ADBC) program, grant numbers 1802504, 1802352, 1802134, 1802033, 1802270, 1802255, 1802239, 1802446, 1802305.
The pteridoportal taxonomic thesaurus is based on the Checklist of Ferns and Lycophytes of the World, generously provided by Michael Hassler.