and Laboratory Methods. 



2615 



LXII. Appendix to Ferns. 



(a) Camptosonis rhizophyllus (L.) Link. Walking-fern. 



Family, Polypodiaceae. 



The walking-fern is common on rocks, especially on limestone. Study fresh 

 or herbarium specimens. 

 Spofophyte. 



1. Sketch a plant with several leaves, some of which have rooted at the 

 long acuminate tips, and show plantlets of various sizes. This is a simple and 

 effective method of vegetative propagation. Leaves are usually highly special- 

 ized organs which have to a large extent lost the power of reproducing the indi- 

 vidual. There are, however, many cases, like the present one, even in the higher 

 plants, where the leaves retain the power of reproduction to a remarkable degree. 



Fig. U. —Diagram of life cycle of ordinary fern. 



(b) Filix hulbifera (L.) Under w. (Cystopteris.) Bulb-bearing Bladder-fern. 



Family, Polypodiaceae. 



This fern grows on moist rocks, especially limestone, and is easily cultivated 

 in greenhouses, where it propagates itself extensively. 

 Sporophyte. 



L Sketch a leaf showing a number of fleshy brood-buds (bulblets). On 

 which side of the leaf are they developed ? 



2. Under dissecting microscope draw a brood-bud which has just fallen ofif. 



3. Draw a young fern plant which is developing from a brood-bud. Is this 

 an efficient method of vegetative propagation ? Why ? 



LXIIL Lycopodium liicidulitm Michx. Shining Lycopod. 

 Class and order, Lycopodiales. Family, Lycopodiaceae. 

 This lycopod grows in moist woods and on shady cliffs. Use fresh, alco- 

 holic, or herbarium material. 



