Hrm, depends what you mean by 'usual'... (Admittedly one would think Sandy might use such words with a degree of precision, if the context is the GB...) Informally, most users of such terms wouldn't think once (much less twice) about gametes. (It just so happens that most informal usages, through biological accident, to so correspond...)
> There are many botanical instances of plants which are male and female
> at different times of the year (i.e. their stamens mature faster than their
> stigmas, or vice versa), which is an alternative model to the usual animal
> hermaphrodite (such as snails). OTOH, it resembles some of the animal-based
> mermen rather too closely, IMO - given the 'intersex' associations of water
> in Glorantha, I think there ought to be some blatant hermaphrodites in the
> oceans somewhere.
I'd have thought that that, too, would be within the gamut of possible merfolk sexuality. Not that a candidate species springs to mind. Though since the distinction between 'isogamous' and 'true hermaphrodite' isn't, so far as I can see, necessarily directly observable, unless there are discernably separate sexual characteristics, or whatever. (I'm assuming the gametes wouldn't be directly sexable...)
> Seaweed can be oogamous (e.g. kelp), isogamous, anisogamous [...]
And you didn't think 'thingygamous' was a good subject line, eh?
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