GIANT LEATHER FERNSSouth of town, waterlogged mangrove doesn't always give way just to thin-soiled, cactus-rich, desert scrub. In some places mangrove yields to grassy marshes -- clumps of grass rooted in mud, with soil between clumps either submerged beneath saltwater or soaked. Often, even in this important, officially recognized "Biosphere Reserve," cattle graze these marshes. Sometimes Giant Leather Ferns, ACROSTICHUM DANAEFOLIUM, emerge from the soggy grassland. Taking in their effect, one might say "emerge like a Viking on a beach." In fern terms, these are huge, coarse-looking things giving the impression of having been rooted exactly where they are since dinosaur times. That's one of them below, with fronds soaring nearly nine feet (2.5 m) above the muck.
In the above picture the inset on the right shows a close-up of the fern's fertile pinnae. There you can see that this species produces its dusty, cinnamon-colored spores not in dainty clusters of spore-producing sporangia, like the North's little Woodsias and Shield Ferns, but rather they are randomly and abundantly spread across the entire lower surfaces of fertile pinnae. Actually there are two species of Acrostichum fern found in places like ours, and I bet the other one, A. aureum, called Mangrove Fern, Golden Leather Fern, Swamp Fern and a host of other names, is found here, too. The "Flora of Quintana Roo" lists both species. Speaking of that "Flora of Quintana Roo," which was written in Spanish and gives plant names in Latin, sometimes when you know what a plant's family or genus is it's helpful to have a list of species known to occur in the families and genera of the area you're studying, or next to. For example, I knew from experience that I had a Pedilanthus in the Mammillaria habitat shown above, but I had no idea which Pedilanthus it was. The "Flora of Quintana Roo" listed only Pedilanthus tithymaloides for that contiguous state, it looks like that species when I Google it, so a good guess is that what's shown in my picture is that species. The "Flora of Quintana Roo" can be downloaded at http://biblio68.ibiologia.unam.mx/FullText/lfl2.html. |
