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Ferns common on the Peak
Student Project 3 (2004) SKH Lam Kau Mow Secondary School
Hui Wing Yan 許穎欣 (6B)
Lam Wai Ling 林慧聆 (6B)
Mak Suk Har 麥淑霞 (6B)
What are Ferns?
Ferns are non-flowering vascular plants, classified in the Division Pteridophyta.
They produce spores in sporangia borne on the lower surface or along edges of their leaves.
Spores

As shown in the photo, there are numerous sori on the lower surface of the frond. Sorus is a cluster of sporangia, which is a spore-producing structures.

In ferns, sporophytes are diploid, representing the dominant generation.
They are responsible for spore production. When spores are released and landed on a suitable substratum, they will give rise to minute gametophytes.
The latter is the haploid generation and would produce sex organs, which produce gametes.


Spores are usually produced in large amount to compensate their loss during wind dispersal. They are light and small, and thus they can be carried by wind easily.
Each sporangium breaks open along the annulus to release the spores.

Circinate leaves

As shown in the photo, the young leaves of this fern are circinate (coiled from the tip downwards) at the tip of the leaflets. It probably helps to protect the dedicate tips. This is a primitive character common in ferns.


Common in Hong Kong
Have erect habit and robust stems
Leaves are light green
Medicinal


Common in Hong Kong
Grows in damp soil, along banks of stream or close to waterfall
Fronds are fleshy in texture and thin


Common in Hong Kong
Grows in both shaded or exposed areas
Variable in size
Fronds are covered with fine hairs and soft in texture
It is characterised by its deflexed basal pinnae


Rather rare in Hong Kong
Have falcate pinnae which curve upwards.


Common in Hong Kong
Grows in shade along soil banks, near streams, appressed to brick walls and beneath trees
Have round, fan-shaped pinnae
Sori form lines along the margins
Erect tapering lamina with pinnae gradually becoming smaller in size.


Common in Hong Kong
Grows in the nooks and crevices of moist limestone rocks
Being cultivated as an ornamental plant, too
Characterised by its non-wettable leaves, which allow rain drops to be removed quickly
Used as a herb which is anti-inflammatory, antidiuretic and antitussive.
Pyrrosia adnascens 貼生石韋
Pyrrosia adnascens 貼生石韋
Common in Hong Kong
Grows at higher altitudes with epilithic and epiphytic characteristics
Fronds are jointed to the rhizome
Erect lamina lanceolate, thick and fleshy
Sori are naked on the lower surface of the frond
Dimorphous species with sterile, small fronds and fertile, longer fronds
Used as a medicine which is anti-inflammatory
Pronephrium simplex 單葉新月蕨
Pronephrium simplex 單葉新月蕨
Common in Hong Kong
Grows on wet soil, in woods, or along the banks of shaded ravines
Small and simple
Containing only a single frond on a long strip
Pteris vittata 蜈蚣草
Pteris vittata 蜈蚣草
Common in Hong Kong
Grows almost everywhere, especially on rock crevices and surfaces, near walls, dry soil and on roadsides
Can grow in both acidic and very dry conditions
Have a cluster of pinnate fronds with pointed and thin pinnae
Quercifilix zeylanica 地耳蕨
Quercifilix zeylanica 地耳蕨
Common in Hong Kong
Grows on damp soil, attached to rocks in shade
Dimorphous species with much longer and thinner fertile fronds
Flat-broad leaves appressed to the substratum
References
So, M.L. 1994. Hong Kong Ferns. Hong Kong Urban Council.
Lee, W.T.C., Chau, L.K.C., and Wu, S.H. 2003. Flora of Hong Kong Pteridophyta. Kadoorie Farm & Botanic Garden, Hong Kong.


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