Cormophyte Spore Classification [antikvár]

geol. foren. forhandl. bd 83 h. 1 1961 6S Cormophyte Spore Classification An Outline Based on the Apertures (Tremata) By G. Erdtman and H. Straka Systems for spore classification are generally based on several spore characters. The "NPC-system" outlined below, is based on one feature only, viz. the apertures (tremata), their number (N), position (P), and character (G). Chiefly according to the number of the apertures the following classes can be established ("classification N", cf. Column N, Tab. 1—7): N 0. Atreme spores: without aperture(s). N 1. Monotreme (1-treme) spores: with one aperture. N 2. Ditreme (2-treme) spores: with two apertures. N 3. Tritreme (3-treme) spores: with three apertures. N 4. Tetratreme (4-treme) spores: with four apertures. N 5. Pentatreme (5-treme) spores: with five apertures. N 6. Hexatreme (6-treme) spores: with six apertures. N 7. Polytreme (oo-treme) spores: with more than six apertures. N 8. Anomotreme spores: with irregular or irregularly placed apertures (the spores in N 1—7 are nomotreme, i. e. provided with regular apertures). Pleotreme spores have more than one aperture. Spores with four to many zonally (monozonally or pleozonally) distributed apertures may be referred to as stephanotreme (monozono-stephanotreme or pleozono-stephanotreme; in the latter there are four or more than four apertures in each zone). N. B.: "Spore" here and in the following means pollen grain or spore or both according to the context. A more detailed classification can be made if, besides number, the character (shape etc.) of the apertures is known. The following classes may be distinguished ("classification C"; cf. column C, Tab. 1—7): C 0. Character unknown (ignote). C 1. Monolept, dilept etc. ("tenuitatiferous") spores: with one or several leptomata (Gr. leptoma, plur. leptomata; from leptos, thin), i. e. thinwalled areas which may be engaged in forming an opening in connection with the normal exit of substance from the inner part of the spores. 1, -. H m