> There are as many as 12 million species of fungi, yet there are just 155,000 or so known species, leaving vast numbers undescribed.

"There are as many as 12 million species of fungi, yet there are just 155,000 or so known species..."

The second number makes sense: it's how many species we've identified. But the first number... how can we know how many we don't know?

This kind of thing pops up all the time (X number of crimes go "unreported"... if they're unreported how can we say that?).

I get that they may be estimates. If so, it's pretty important that that estimation process is described.

Might as well say there are as many as 12 trillion species of fungi.

The bartender says "You can't come in here."

They say "Oh C'mon we're fun guys!"