Marsilea macropoda Engelm. ex A.Braun

  • Authority

    Mickel, John T. & Smith, Alan R. 2004. The pteridophytes of Mexico. Mem. New York Bot. Gard. 88: 1-1054.

  • Family

    Marsileaceae

  • Scientific Name

    Marsilea macropoda Engelm. ex A.Braun

  • Description

    Species Description - Plants forming dense clones; roots only at nodes; stipes 5-39 cm long, hairy; pinnae 9-35 x 8-39 mm, conspicuously whitehairy abaxially, hairy adaxially, hairs often exceeding margin to make pinnae appear white-margined from above; sporocarp peduncles erect, frequently branched, attached 2-4.5 mm above bases of stipes, stalks 8-17 mm long, common trunk of branched stalks 1-5 mm (rarely 2 or 3 unbranched stalks attached separately to same stipe); sporocarps strongly ascending, 6-9 x 4.5-5.5 mm, 2 mm thick, elliptic or quadrate in lateral view, covered with matted and often twisted hairs, proximal tooth of each sporocarp 0.4-0.5 mm long, blunt, distal tooth absent or present as slightly raised area; raphes 1.6-2.4 mm; sori 19 -23 per sporocarp.

  • Discussion

    Zaluzianskia macropus (A. Braun) Kuntze, Revis. Gen. Pl. 2: 823. 1891. Type. U.S.A. Texas: swamps of Guadalupe bottoms near Victoria, Lindheimer III 573 (MO; isotypes B, BM, G, K, LL, MO, PH, UC!, US).

    Hybrids with M. vestita have been reported from Texas (Johnson, 1986: 73).

  • Distribution

    Aquatic along seasonally wet roadsides, black clays (pH 7-8), and less frequently on sandy soils; 0-1400 m. USA (Ala, La, Tex); Mexico.

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