And the non-glowy moss doesn't have it?

Nope. 

The glow continues to, slowly, fade. It might last an hour or two at this rate.

What does the non-glowy moss have instead? And he can Google glowy moss while he examines the two things, any other differences—?

It just ends, scraped off improperly, apparently.

Some mosslike things glow blue sometimes. Some moss looks yellowy-glowy, but Schistostega doesn't actually make light just reflects it weird.

And can he figure out what species this one is...?

Nope? This is either a bad sample of moss that doesn't match up to the pictures on the 'net, or some weird subspecies that isn't easily found. It more resembles leucobryum glaucum than any of the other New England natives, but the little bristles split much more, to incredibly tiny, fuzzy levels.

Well. He guesses he'll collect more tomorrow. He tries examining it and the internet some more for anything else he might've missed.

The internet thinks it's a little weird that any moss was growing inside a crypt. But it's not a lichen or a mold, it's definitely a moss of some sort.

A little weird? Is there precedent?

It could be some kind of cave moss? They can deal with low light and stone walls.

The glow has faded completely. He's still not tired like he should be having just pulled an all-nighter, but he no longer feels like he's on half a dozen cups of coffee.

...hmmmmmm.

Hmm.

He bites his thumb. Not hard enough to bleed, just hard enough that it should hurt.

It hurts.

Normally? It doesn't hurt less perhaps? Or stop hurting faster?

Not really. Not clearly enough to definitely be a magical effect and not wishful thinking, at any rate.

Darn.

...he can't go there again, can he, it's very late and his father will complain...

He goes to school the following day.

School's mood today is: Thank god it's Friday! The only juicy bit the gossip mill produces relevant to Cally is that her father had an argument with someone at the sporting goods store. Not at all clear if this is in any way relevant.

...argument about what?

Something about the forest preserve nearby?

...huh. The rumors know anything more specific than that?

Kevin's dad didn't want to talk about it and Kevin didn't want to push the issue. Best not to get too interested in them, the father said.

...he thought they were new in town. Do they have—history?

They have money.

...yes, lots of people do.

Kevin's dad doesn't want to piss off rich people, apparently. And Kevin himself is looking annoyed.

Alright, thanks for the info, Kevin.