What is this tea stalk that almost every cup of tea in anime has? Here are two photos of tea stalks in their natural habitat:

 

I've never seen those myself when I made tea, and I've been making at least two cups of tea every day for the past six years.

Is it a Japanese tea thing? Is it sorted out from the leaves in other regions? I've been buying some export green teas from Japan (sencha mostly) but I've never had any tea stalks appear in my cups. How do I get them?
One type of tea style popular in Japan is Karigane (http://en.wikipedia.org/wiki/Karigane_(tea)#Karigane) Karigane tea is made from the stalks, not the leaves. This means anything that slips out of the teapot's strainer will be a stalk. This could be one of many types of Japanese tea: you can find Gyokuro Karigane (the stems and veins of Gyokuro tea leaves) or Hojicha/Houjicha Karigane (stems of tea leaves roasted in the same way as standard Houjicha.)

Stem teas tend to be a lighter, more delicate version of their heavier-hitting leafy counterparts.



You can also find blended teas, where there will be leaves as well as stems in the mix.

P.S. I like the "natural habitat" line :)