Ultramicroscopic Characterization of Mature Pollen Grains of Habenaria sagittifera Microsporogenesis and Male Gametophyte Development in Uncaria hirsuta Havil. (Rubiaceae) Ultrastructural and Cytochemical Study on Mature Pollen of Pinus tabulaeformis Biochemical Characteristics of Pollen Wall Glycoproteins Separated on Ricin-Sepharose 4B in Cucurbita pepo Further Studies of Pollen Wall Glycoproteins in Cucurbita pepo L. PECTATE LYASE-LIKE10 is associated with pollen wall development in Brassica campestris The Structure of Pollen Wall and Its Relation to Po41en Aggregation in Cymbidium goeringii (Rchb. F.) Rchb. F. POLLEN WALL ULTRASTRUCTURES OF THE SUBTRIBE TUSSILAGININAE (ASTERACEAE: SENECIONEAE) OF THE EASTERN ASIA AND THEIR SYSTEMATIC AND TAXONOMIC SIGNIFICANCE Ultramicroscopic Characterization of Mature Pollen Grains of Habenaria sagittifera Pollen Wall Development in Gossypium hirsutum L.