1 - in crater @crazyJoe
1 - on route to Authority Prison to rescue dude.
1 - After u clear distillery (Eastern Wasteland)

Where are the others please... When I play on Hard I wanna find them all.

http://rage.wikia.com/wiki/Desert_Spore

There are 9 or 10. Actually 2 in the crater at swamp.
One at northern watchtower on way to prison. One by mail box of crazy scientist guy, kavisir or something,one around the corner from the radio tower mission entrance. I think one around ghost hideout, that may be something different though. One by power plant entrance. One by distillery entrance on left. One by wellsprings entrance. One after you hit a crazy jump by wellspring heading toward dead city, YouTube should help with that one. I actually think there may be 2 on road to authority prison. I'm 98% positive on all of them. It's what I remember of the top of my head.

Did you click on the link above you?

Two will be rewarded for completing the Miracle Cure quest
Two can be found in the crater behind Crazy Joe's swamp
Left of the Mutant Bash TV entrance near the freeway ramp
South-southeast of the Wellspring sewer entrance, close to a nearby large rock
At the Northern Watch Tower, by the northwest corner.
Near Dr. Kvasir's mailbox
At the mailbox on the dead-end jump near Wellspring
By the bridge to Subway Town
At the mailbox on the dead-end about half-way towards the prison
At the end of the Outrigger sewers
At the Abandoned Distillery entrance
At the Power Plant entrance

No it's from memory but like I said some may left out or some may be other plants and I just forgot. Just wanted to get out a quick answer y
For you.

by the way MAX HP you can have is 140 just fyi.

does anything else increase HP? I did 2 apophis infusions and am up to 122

The official book says there are 11 in the Wastelands, plus 2 more in the sewers.

Thus the maximum number of health boosts you can get is 6. I ended up with all 6 health boosts, plus both defib upgrades, plus maximum armour upgrade, plus the Crimson armour. I was was to OP, nothing could touch me.

Do people still learn how to read in school?

14 desert spores found so far, all confirmed, make 7 Apophis Infusions, raising your base health to 170 or 177 with the engineering armour bonus.
Use an Adrenaline Overdrive to raise it even further.

-> Two in the sewers? Could you tell us where that second one in the sewers is? There'd be 15 desert spores if that's true, which probably means there's another somewhere.