#spore

• Acroconidium — An asexual spore (conidium) formed exclusively at the tip, apex, or extremity of a specialized hypha (conidiophore) or a conidiogenous cell, essential for fungal dissemination.
• Acrochroic — Regarding spores or mycological cellular structures; exhibiting intense pigmentation localized exclusively at the apex, tip, or terminal extremity, while the rest of the membrane remains translucent.
• Acropleurogenous — Developing, originating, or arranged both at the apex (apical) and on the sides (lateral) of a structure, plant stem, or hyphal filament. In mycology, the term describes a specific mode of spore or conidia formation and branching on conidiophores, where they are structurally generated across the entire terminal zone and the flanks of the main axis, ensuring efficient reproductive material dispersal.
• Acrospore — A type of asexual spore, conidium, or microscopic reproductive body that develops and separates exclusively at the upper extremity or apical zone of a specialized hyphal filament (conidiophore). This cellular structure, specific to lower fungi, is formed through terminal constriction or budding, ensuring highly efficient airborne dispersal of genetic material in the environment for species propagation.
• Aerobiology — An interdisciplinary branch of biology that deals with the study of living organisms and particles of biological origin (such as bacteria, fungi, pollen, spores, cysts, and viruses) passively transported through the air, as well as with the analysis of their movement, survival, and impact on the environment and human health.
• Aeropalynology — A branch of palynology that studies spores, pollen grains, and other microparticles of plant or fungal origin suspended in Earth's atmosphere and transported by air currents. This discipline has major importance in establishing pollen calendars, monitoring air quality, and diagnosing respiratory allergies or seasonal rhinitis.
• Agamete — An asexual reproductive cell (such as a spore, zoospore, or conidium) capable of directly giving rise to a new living organism without previously fusing with another sexual cell. Its functional structure is specific to lower plants, fungi, and protozoans that utilize alternation of generations in their biological cycle.
• Agametangia — A rare plural or adjectival form used in botany to denote asexual organs or cellular structures inside which agametes (spores or zoospores) are formed in lower plants, fungi, or algae. The term describes the non-sexual reproductive apparatus before modern morphological standardization.
• Agametangium — An asexual reproductive organ (sporangium) found in algae, fungi, and lower plants, inside which exclusively agametes (spores or zoospores) are produced. Its anatomical structure is adapted for protecting and releasing non-sexual multiplication cells, ensuring species perpetuation without fertilization.
• Agamocyte — An asexual reproductive cell or specialized spore that develops directly, without prior fusion with another cell, giving rise to a complete new individual. Structurally, agametes produced by lower organisms bear this name during cytological phases in which they exhibit no sexual differentiation or complementary gametic potential.
• Agamophytes — A taxonomic or ecological group of plants characterized by reproduction carried out exclusively through spores or vegetative means, without the intervention of sexual organs or the process of gametic fertilization. Structurally, this category includes lower plant forms (such as certain algae, fungi, and lichens) in whose life cycles the agamic multiplication phase is absolutely dominant or unique.
• Agamohypnospore — An asexual resting spore, equipped with a thick, impermeable cell wall, which forms without any prior gametic fusion and enters a dormant state (hypnobiosis) to survive unfavorable environmental conditions. Structurally, this agamic cell concentrates storage materials, allowing lower plants, algae, or fungi to propagate their genome intact until optimal germination conditions are restored.
• Agamospore — A spore formed directly, without any prior gametic fusion or genetic recombination, serving as an autonomous unit of asexual propagation in algae, fungi, and certain lower plants. Structurally, the agamospore retains the complete chromosome number of the parent organism (often being diploid) and is capable of germinating as soon as it encounters favorable conditions, generating an identical individual.
• Akinetospore — An asexual, unicellular reproductive spore completely lacking flagella or cilia and consequently non-motile (immobile), characteristic of certain species of green algae, red algae, or lower fungi; unlike zoospores, it cannot move autonomously in the aquatic environment, being passively dispersed by water currents or wind. This biological structure is protected by a well-developed, rigid cell wall that allows it to survive unfavorable ecological conditions (such as temporary drought or temperature drops) until the environment becomes optimal for germination.
• Akinetosporangium — A specialized sporangium-type cellular organ (spore sac) inside which only akinetospores (asexual, unicellular reproductive spores completely lacking locomotion organs like flagella or cilia) are formed and matured; this biological anatomical structure is characteristic of certain genera of filamentous algae or lower fungi. The wall of this vessel is typically denser and structurally adapted to protect the static reproductive cells against destructive abiotic factors in the aquatic or terrestrial environment until the passive release phase of the spores.
• Aleurospore — An asexual vegetative spore or conidium with a thick wall, produced terminally or laterally directly on the mycelial hyphae of certain microscopic fungi. This spore type develops through the septation of a conidiogenous cell and remains closely attached to the parent hypha until the natural disintegration of the mycelium, ensuring the survival and efficient dissemination of the fungus.
• Ameiosis — A special type of aberrant or modified cell division in which classic meiosis is not completed or is entirely replaced, resulting in reproductive cells (gametophytes or spores) that retain the unchanged diploid chromosome number of the parent cell (without chromatic reduction). This structural phenomenon is closely linked to the process of apomixis in certain plant species, allowing asexual reproduction through genetically viable seeds.
• Amerospore — A type of asexual, unicellular spore of microscopic size, lacking transverse or longitudinal septa, and having a spherical, oval, or elongated shape. This structural element represents the simple propagation unit found in certain species of imperfect fungi (Deuteromycota), morphologically adapted for rapid dissemination in the environment via air currents or water.
• Amphigenous — Growing, developing, or producing on both sides of a plant organ (such as leaves or stems); in mycology, it describes a type of parasitic fungus whose reproductive structures (conidia, spores) structurally appear and develop on both the upper and lower surfaces of the host plant's leaf.
• Amphispore — A special type of resting spore, with thickened and often ornamented walls, produced by certain parasitic fungi (especially from the order Uredinales / rusts) under environmental stress. This spore ensures the survival of the organism through winter or prolonged drought, having a variable latency period and the ability to germinate directly on the host plant.