A small pretty wild flower blooming at early spring and the unique mushroom showing beehive structures

Today I‘d like to introduce a small pretty flower that is blooming from late winter to early spring. When I happened to find this flower at the natural habitat in late February last year, the flower had already bloomed on its stalk.  So, I didn't know the very beginning of blooming. 

This is a flower of Coptis japonica var. dissecta (Seriba-ouren in Japanese name) that was blooming in a shady spot alongside the forest road where I usually walk around. Actually, there are two types of flower, one is a flower that has both pistils and stame like an ordinary flower, the other is a male flower (stamen only).  The following two photos were taken in late February last year.

To add some information, this is a type of perennial plant in the Ranunculaceae family. As the species name “japonica” suggests, it is endemic to Japan. It grows naturally in mountains and forests, but not found everywhere. The underground rhizomes are yellowish brown and are used as an herbal medicine called “ouren”. The variety name ”dissecta” came from its leaf shape like celery.

This is a male flower (stamen only) of Coptis japonica var. dissecta that was blooming nearby. 

As mentioned above, I’ve not noticed the early stage of blooming, so this year I’ve been trying to observe the budding stage.

This is a leaf that resembles a leaf of 'Seri', a Japanese parsley. This photo was taken on January 23rd of this year.

At that time, only the flower buds were visible at the base of stock of this plant.

This photo was taken on February 12th, 20 days later since then. At the stock of some plants, flowers emerged from flower buds and  began to bloom, although the flower stalk still bents. There are water droplets on it since it was right after the rain. It may be a male flower, I suppose. I will further observe the blooming process.　

Other topics on the mushroom.
This was a mushroom growing on a dead branch that had been lying on the roadside of the forest road. The upper side (a pileusis) was smooth.  (Photo taken on February 4th)

But, when I took a look at the backside, there were many holes that looked like beehive.

So, its Japanese name is 'Hachinosu-take', Hachinosu means beehive. In English, it is called hexagonal-pored polypore. It is said to be an edible mushroom, however I don't feel like eating.

This is a close-up photo of the tubes of this mushroom.  

We can see the short protrusions inside the tube. What is this for?

I've researched on these protrusions through website, but I couldn't really have no idea about this.

Therefore I would like to state my absurd hypothesis. As for the underside structures of the mushroom cap, they can be roughly divided into 3 types.

This is a lamella structure, a blade-like organ. 

This is a needle-like structure, a spine in technical terms.

The remaining one is the beehive-shaped structure mentioned above.

I don't think they are completely divided forms, but I suppose something like intermediate can be existed. 

I think this intermediate form is the short protrusions inside the tube. Is that right?