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Pollen characteristics of the tribes Calycophylleae, Cinchoneae, and Hillieae (Rubiaceae)

Identifieur interne : 002F59 ( Main/Exploration ); précédent : 002F58; suivant : 002F60

Pollen characteristics of the tribes Calycophylleae, Cinchoneae, and Hillieae (Rubiaceae)

Auteurs : Lennart Andersson [Suède]

Source :

RBID : ISTEX:CD8A99B046CA330E60B4687D83468978158C17E3

Abstract

Pollen grains were studied on acetolysed material with the aid of the SEM. They may be classified into four types. Type I is characterized by thick (0.92.1 μm) exine with reticulate surface, by distinct colpi with acute ends, and by distinct ora. It occurs in the genera Alseis, Calycophyllum, Ferdinandusa, and Schizocalyx. Ferdinandusa is further characterized by its lumina being differentiated into two distinct size classes. Type II is characterized by a usually thin (usually 0.7–1.1 μm) exine with foveolate surface, by distinct colpi with obtuse to truncate ends, and by poorly demarcated ora. It occurs in Cinchona, Joosia, Ladenbergia, and Remijia. Pollen grains of Joosia are mostly 4–colporate. Type III is characterized by a thick (1.7–2.0 μm) exine with coarsely reticulate surface, colpi are lacking or short and the ora are clearly demarcated. It occurs only in Capirona. Type IV is characterized by a thin (0.5–0.8 μm) exine with a psilate or foveolate surface and usually indistinct colpi with obtuse ends, and by distinct ora. It occurs in Cosmibuena and Dolicholobium. Pollen grains of Balmea, Hillia, Macrocnemum, Stilpnophyllum, and Wittmackanthus, combining features of Type I and II, do not fit into either of these four groups. It is concluded that both the tribes Calycophylleae and Cinchoneae remain eurypalynous in spite of a recent emendation. It is suggested that pollen characters serve best to characterize genera and small groups of genera. It is further suggested that Type I pollen is plesiomorphic in most or all characteristics.

Url:
DOI: 10.1111/j.1756-1051.1993.tb00072.x


Affiliations:


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<div type="abstract" xml:lang="en">Pollen grains were studied on acetolysed material with the aid of the SEM. They may be classified into four types. Type I is characterized by thick (0.92.1 μm) exine with reticulate surface, by distinct colpi with acute ends, and by distinct ora. It occurs in the genera Alseis, Calycophyllum, Ferdinandusa, and Schizocalyx. Ferdinandusa is further characterized by its lumina being differentiated into two distinct size classes. Type II is characterized by a usually thin (usually 0.7–1.1 μm) exine with foveolate surface, by distinct colpi with obtuse to truncate ends, and by poorly demarcated ora. It occurs in Cinchona, Joosia, Ladenbergia, and Remijia. Pollen grains of Joosia are mostly 4–colporate. Type III is characterized by a thick (1.7–2.0 μm) exine with coarsely reticulate surface, colpi are lacking or short and the ora are clearly demarcated. It occurs only in Capirona. Type IV is characterized by a thin (0.5–0.8 μm) exine with a psilate or foveolate surface and usually indistinct colpi with obtuse ends, and by distinct ora. It occurs in Cosmibuena and Dolicholobium. Pollen grains of Balmea, Hillia, Macrocnemum, Stilpnophyllum, and Wittmackanthus, combining features of Type I and II, do not fit into either of these four groups. It is concluded that both the tribes Calycophylleae and Cinchoneae remain eurypalynous in spite of a recent emendation. It is suggested that pollen characters serve best to characterize genera and small groups of genera. It is further suggested that Type I pollen is plesiomorphic in most or all characteristics.</div>
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