Cross section of Laminaria sp. under microscope (magnification: x400) (LI_HoPan)
Updated on 25/10/2016

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SC 295, the Chinese University of Hong Kong

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Well-done.

Informative description!

Can you suggest a function for paraphyses?
by Cherry_Chow (Teacher) at 2016-11-25 09:52:19
This is the cross section blade of laminaria algae sporophyte. The cortex, medulla, and epidermis can be seen. The zoosporangia is enclosed by paraphyses, which protect the zoospores inside against dessication. Laminaria is heteromorphic haplodiplontic life cycle, and attaches to rocks/susbtrate with the holdfast. Laminaria is used as food in many dishes.The haploid gametophyte phase is microscopic, and the diploid sporophyte phase is macroscopic. The gametophytes need low temperatures (and blue light) as optimal conditions to become fertile. Sporophyte can release sori year-round. Why is there such a huge size difference between sporophyte and gametophyte of laminaria?
by leung ho ching (Student) at 2020-12-07 22:28:08
Ho Ching: thanks for your input and informative description!
by Cherry_Chow (Teacher) at 2020-12-16 06:25:23


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cortex
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source of zoosporangium which containing paraphytes, zoosporangia
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petal , sepal , pileus , pistil , suspensor , stipe , epidermis , ovule , Labellum , stamen