Seven years ago, I attempted to cross a pummelo with a complex microcitrus hybrid, the Faustrimedin.
This spring some of the resulting seedlings are starting to bear fruit.
Take a look at
http://www.homecitrusgrowers.co.uk/hybridseedlings2009.html

Mike aka Citrange

Very nice mike !

Nice. I find it interesting that such a small seedling tree can begin to produce blooms. Is this unusual?

Mike,
Nice job. I like the way you think.
There has to be a lot of great hybrids come out of crossing the native Australian citrus with traditional citrus.
Terry

Very, very interesting!
Keep up the good work.

Greets
mike (the one from switzerland)

Mike,
Congrats!
--ivica

Mike, is the fruit still growing? Or what happend since April?

Greets
Mike_N, Switzerland

My newest australian hybrids:

for bonsai use this microcitrus australasica var. sanguinea hybid:


For cold hardy trials this hybrid:

Sorry I've taken a long time to update the pictures of my hybrids.
Unfortunately, we've had a very cool summer here in the UK and these fruits have grown very slowly indeed. They are still only about the size of a large grape. Interestingly, the plants seem to produce flowers almost continuously.
The two pictures below are from seedlings 7 and 10 of the original batch.
Seedling 1 has also flowered but not held fruits.




Mike

As usual, very interessting!!
Thank's for sharing Mike!

Mike
(from Switzerland)

Are you going to taste it?

Yes, I'll taste it when ripe.
But I can predict that it will be awful!
In my climate pummelos never develop any sweetness - they need much heat. And Faustrimedins are disgustingly bitter. So there's little hope for a tasty hybrid!

Very interesting work, so you have any other hybrids in the works?

Ummm.... okay... so what possessed you to cross "no sweetness" with "disgustingly bitter"?

I had thought there was a tasty goal in mind...

To Fofoca.
It may seem strange to you, but for me, growing citrus isn't really about getting delicious fruit. Here in England it's impossible to compete with commercially imported fruit from warmer climates. Yes, my little potted plants produce a few nice lemons and limes and satsumas every year. Even a few tasty oranges and mandarins. But the sweetness isn't there. The summers are just too short and too cool. So, I've come around to mainly growing ornamental citrus fruits - unusual fruits, strange fruits, rare fruits, historic fruits. If they're pleasantly edible that's a bonus!
Of-course, you're in sunny California. My pummelo grown in your area would probably be delicious. Even my Faustrimedin might be just a bit on the tangy side. So perhaps over there my new hybrids might be good to eat. But for me, they're just for fun - and a cucumber-shaped citrus fruit sounded like good fun!
Mike.