INTRODUCTION TO CRYPTOGAMIC BOTANY, 



179 



coasts. Crouama is remarkable for possessing the habit of 

 Batrachospermum. Halurus and Oriffiihsia, have their 

 representatives all round our coasts, but are also found in 

 the southern hemisphere, where also a large number of species 

 of Oallithamnion occur, though they are more numerous 

 northwards. 



2. Spyridiace^, Harv. (Spyridiew, J. Ag.) 



Fig. 44. 



a. Conceptacle of Spyridia flamentosa, Harvey, magnified. From a 

 specimen communicated by Mrs. Griffiths,* with the threads in which 

 the spores are generated from the endoohromes. 



h. Transverse section of conceptacle of Chylocladia Kaliformis, Grev. 

 showing the origin of the spores from the central placenta, magnified. 

 From a specimen communicated by M. Lenormand.f 



c. Vertical section of the conceptacle of Oigartina Teedii, mag-nified. 

 From Sir W. J. Hooker's Herbarium. 



d. Endochromes in the tissue surrounding the conceptacles of Oigar- 

 tina pistiUata, to show their communication with each other, highly 

 magnified. From a specimen received from Lenormand. 



e. Portion of conceptacle of Solieria chordalis, after Harvey. 



* The conceptacles are usually lobed, and there are several distinct 

 masses of spores. The simplest case is purposely represented, to show 

 the advance which has been made from the naked nuclei otCalUthamnion. 



f The walls of the conceptacle appear very different in different 

 sections, according as the section happens to divide the component cells. 

 12* 



