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Because the Marsileaceae produce two kinds of spore (and thus two kinds of gametophyte), they are called heterosporous. While heterospory is the norm among all plants with seeds, such as the flowering plants and conifers, it is very rare among other groups of plants. Also, most heterosporous plants produce their two kinds of sporangia in ...
Gurney's Seed and Nursery Co. is a mail-order seed and garden plant company based in Greendale, Indiana. Founded in 1866, Gurney's specializes in vegetable and flower seeds, gardening supplies and nursery stock, including trees, shrubs, perennials, fruit trees and berries, fertilizers and plant foods. [1]
Heterosporous plants, such as seed plants, spikemosses, quillworts, and ferns of the order Salviniales produce spores of two different sizes: the larger spore (megaspore) in effect functioning as a "female" spore and the smaller (microspore) functioning as a "male".
Park Seed Company is an American mail-order and eCommerce seed company based in Greenwood, South Carolina founded in 1868. Park Seed specializes in garden seeds, offering more than 1,100 varieties of flower, vegetable, and herb seeds, plus a large selection of bulbs, live plants, and gardening accessories. Park Seed Company distributes millions ...
The J.W. Jung Seed Company is a family-owned and operated garden seed company founded in 1907 in Randolph, Wisconsin by John William "J.W." Jung. [1] The company publishes several seed catalogs including Jung Seed, Totally Tomatoes, Vermont Bean Seed Company, Edmunds Roses, Roots & Rhizomes, R. H. Shumway, McClure & Zimmerman and HPS Seed. [2]
W. Atlee Burpee & Company was founded in 1876 by Washington Atlee Burpee in Philadelphia, Pennsylvania, after starting a mail-order chicken business in 1876. The company expanded to selling garden seeds, farm supplies, tools and hogs after customers began asking for seeds they had grown in their native farms.
Heterospory evolved due to natural selection that favoured an increase in propagule size compared with the smaller spores of homosporous plants. [2] Heterosporous plants, similar to anisosporic plants [clarification needed], produce two different sized spores in separate sporangia that develop into separate male and female gametophytes.
The rhyniophytes included "protracheophytes", which were precursors to vascular plants (e.g., Horneophyton, Aglaophyton); basal tracheophytes (e.g., Stockmansella, Rhynia gwynne-vaughanii); and plants allied to the lineages that led to the living club-mosses and allies as well as ferns and seed plants (e.g., Cooksonia species).
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