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Quillwort (Isoetes) (~ 100 Species). HABITAT. SPOROPHYTE: Two-Lobed Corm (Stem (leaf-bearing), Rhizomorph (root-bearing). Stem. Rhizomorph. Primary Growth (Apical Cell/Apical Meristem). (Leaves, Primary Cortex, Primary Phloem, Primary Xylem). CORM: Primary Growth
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SPOROPHYTE: Two-Lobed Corm (Stem (leaf-bearing), Rhizomorph (root-bearing) Stem Rhizomorph
Primary Growth(Apical Cell/Apical Meristem) (Leaves, Primary Cortex, Primary Phloem, Primary Xylem)
CORM: Primary Growth (Apical Cell/Apical Meristem) (Leaves, Leaf Traces, Primary Cortex, Primary Phloem, Primary Xylem)
CORM: Primary Growth (Apical Cell/Apical Meristem) (Xylem Core) Perpendicular to Groove Through Groove
CORM: Secondary Growth I (Lateral Meristem) (Prismatic Layer, Secondary Cortex)
CORM: Secondary Growth I (Lateral Meristem) (Prismatic Layer, Secondary Cortex)
CORM: Secondary Growth (Lateral Meristem) (Prismatic Layer = Parenchyma + Sieve Cells (+ a few Tracheids))
CORM: Secondary Growth II (Basal Meristem) (Xylem Core, Secondary Cortex, Roots)
Secondary Growth: Secondary Growth(Basal Meristem) (Xylem Core, Secondary Cortex, Roots)
SPOROPHYTE: • Megasporophylls • Megasporangia • Megaspores • Microsporophylls • Microsporangia • Microspores
SPOROPHYTE: Megasporogenesis Megasporophyll, Megasporangium, Megaspores (Ligule, Velum, Trabeculae, Tapetum)
SPOROPHYTE: Microsporogenesis Microsporophyll, Microsporangium, Microspores (Ligule, Velum, Trabeculae, Tapetum)
GAMETOPHYTE: Microgametogenesis Microspore, Male Gametophyte, Sperm
GAMETOPHYTE: Megagametogenesis Megaspore, Female Gametophyte, Egg
FERTILIZATION AND DEVELOPMENT (Zygote, Embryo) (Endoscopic Development without Suspensor)
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Pleuromeia (Triassic) Nathorstiana (Cretaceous)