A different pollen signature, if you like, or a different pollen fingerprint.

Allergy to pollen Nasal allergy to pollen is called pollinosis, and allergy specifically to grass pollen is called hay fever.

That's a geranium pollen.

But anyway, take a look at its pollen.

Cool pollen, though.

I am allergic to pollen.

I am allergic to pollen.

Tom has a pollen allergy.

Tom has a pollen allergy.

Perhaps there's more pollen in the city.

Jonathan Drori Every pollen grain has a story

The fossilized pollen was not of savanna vegetation.

Here is a scanning electron micrograph of a grain of pollen.

Melissopalynology the study of pollen and spores found in honey.

That tells me that it's actually been fossilized, this pollen.

And the reason for that is they've got to chuck out masses and masses of pollen to have any chance of the pollen reaching another plant of the same species.

So, that's 20 micrometers across, that pollen grain there.

But not all pollen is quite so simple looking.

The pollen has little barbs on it, if we look.

So, what are pollen's properties? I hear you ask.

First of all, pollen is tiny. Yes we know that.

But pollen forensics can be very subtle.

Bees help plants spread their pollen.

Now, much of the pollen will still be there after repeated washings.

And there is as many different kinds of pollen as there are flowering plants.

With the trains coming in to urban hubs, they can carry pollen with them, very light pollen, and it's just a big supermarket in the city.

Other dicotyledons and monocotyledons have monosulcate pollen, or forms derived from it, whereas eudicots have tricolpate pollen, or derived forms, the pollen having three or more pores set in furrows called colpi.

At night they get covered in pollen, which showers down over them, and then the bristles that we saw above, they sort of wilt and allow all these midges out, covered in pollen fabulous thing.

Like I said, pollen carries the male sex cells.

And then they were so clever, they found a way to analyze fossilized pollen.

Books are the bees that carry pollen from one mind to another.

Pollen is a flower's way of making more flowers.

Pollen is tiny. It gets on to things, and it sticks to them.

Many animals pollinate flowers in exchange for food in the form of pollen or nectar.

Each anther can carry up to 100,000 grains of pollen, so, it's quite prolific stuff.

Many insects have been used by plants as vectors for the transport of the pollination, but not just insects even birds, reptiles, and mammals like bats rats are normally used for the transportation of the pollen.

Beginning with season 5, each episode in the season is named after a song by a rock band that was famous in the '70s Led Zeppelin (season 5), The Who (Season 6), The Rolling Stones (season 7), and Queen (season 8).

Now the way that plants transmit that information is through pollen.

Four very different habitats might look similar, but they've got very different pollen signatures.

And the plant showers them with pollen, and off they go and pollinate.

Books are the bees which carry the quickening pollen from one to another mind.

If the bark is removed around the entire circumference of a tree it is likely to die.

Season 6 The sixth season brought aboard a new set of changes.

Hunting season is over.

Season 4 On May 20, 2004, the show was renewed for a fourth season.