Piotr

Recipes 

In JZ book many recipes call for Hallertau hop. Just Hallertau. But which one is that? In my LHBS there is Hersbrucker, Spalt Select, Mittelfruh, just like here:

NORTHERN BREWER: Hop Pellets

in morebeer I see something called just Hallertau, is it a different sort of hop?

MoreBeer | Hallertau (German) Pellets (2 oz)

mmb

Recipes 

HomeBrewTalk Wiki has some great information on the Hallertau hop growing region of Germany and the many different cultivars developed and grown there.

Category:Hallertau and Hallertauer hop varieties - Home Brewing Wiki

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Saccharomyces

Recipes 

I have hops labeled Hallertau. I don't know which they are but I am guessing they are Hersbrucker or Tradition. Wish I knew.

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Edcculus

Recipes 

I don't claim to know anything about the different varieties. As long as you know the AA%, you should be fine with any.

Piotr

Recipes 

OK, I've found a podcast, where Jamil Z explains, what he means by Hallertau - basically it is Mittelfruh, bu, since it is so hard to buy, we can use any Hallertau variety which comes handy.