Zona Zono etc

Terms combining the basic prefix zon-together with its linguistic derivatives are a source of endless confusion, misunderstanding and superfluous inflation of terms. The prefixes include zon- (in zonorate, for a ring-like endoaperture, the os, at the equator), the outdated, rarely used zoni-(however, with two quite different terminological applications), but especially zona-(indicating exclusively a ring-like feature situated anywhere) and zono- (indicating any feature located strictly equatorially).

A curious example deserves special attention. Terms for ring-like (aperture)

Retipilate left:

drawings from PUNT et al. (2007)

right: drawing from ERDTMAN (1952), p. 22, Fig. 5d left:

Callitriche polymorpha Plantaginaceae reticulum cristatum with small gemmae on thin muri right:

Cuscuta lupuliformis Cuscutaceae reticulum cristatum with microechini

Retipilate left:

drawings from PUNT et al. (2007)

right: drawing from ERDTMAN (1952), p. 22, Fig. 5d left:

Callitriche polymorpha Plantaginaceae reticulum cristatum with small gemmae on thin muri right:

Cuscuta lupuliformis Cuscutaceae reticulum cristatum with microechini

features include zona-aperturate, zona-sul-culus (addressing the polarity by anazona-sulculus and catazona-sulculus), zona-sulcus, zonate, zono-aperturate, and also related names (e.g., "fully zonate condition" sensu GRAYUM 1992). Even the misleading and contradictory zono-sulcus (a sulcus cannot be situated equatorially) is used instead of the correct, but phonetically confusable, zona-sulcus. The trained palynologist may be overstrained. It is proposed that all these terms should be avoided.

To avoid any confusion, not more than two non-interchangeable terms are necessary, without combination of syllables, prefixes or suffixes. 1. any encircling aperture ("zona-aperturate"), irrespective of meridional or equatorial location, is simply called a ring-like aperture. The location or direction regarding the pollen grains polarity is not easy to address, since the orientation of the pollen grain in tetrad stage is relevant. 2. any case with more than three apertures at the equator ("zono-aperturate") is called stephanoaperturate.

0 0

Post a comment