lichens

The stone stairway was covered with lichen.

那石级长满了地。

Fragments of the thallus containing both phycobiont and mycobiont cells may also grow into new lichens, a from of asexual reproduction.

地碎裂片中，如含有藻类和共生时，也可长成独立植，这是一种无性生殖形式。

The lichen is a typical example of the intergrowth among the microorganism, it is fungi, blue bacterium or homobium of the alga.

地就是微生物间共生典型例子，它是和蓝细或藻类共生体。

Reproduction in lichens may be asexual by soredia (algal cells enclosed by fungal hyphae) or by sexual fungal spores, which can survive only if some algal cells are also present.

地可以利用粉芽（丝包裹藻类细胞）进行无性生殖或利用孢子进行有性生殖。