OOGENESIS IN HORMOSIRA 



CONTRIBUTIONS FROM THE HULL BOTANICAL LABORATORY 193 



M. R. Getmw 



(WITH PLATE XX AND SEVEN FIGURES) 



The genus Hormosira is placed by Oltmanns (7) under the 

 Fucaceae and classified with Nothcia in the family Anomaku 

 characterized by him as a group of small and perhaps reduced 

 forms. The genus is fully described and illustrated by II aj 



(gi 



(3) 



nanus 



Itirdieri (fig. 1 ), and the smaller, //. Banksii var. Sieberi or obcon 

 (tigs. 2 and 3). Hookkr (quoting Endlicher) in the Handbi 

 of New Zealand flora (4) describes the same forms, naming 1 



the 



used 



j 



C iiamhi ki.ain at Avoca. n< tr Sydney, on the eastern coast of 

 Australia, It occurs in the tide pools and on rocks where it IS 

 constantly exposed to tin- < lashing of salt spray. 



The plant vari< in color from an. orange-brown to an olive- 

 green. It h | no differentiation into parts, but i- merely a chain 

 • »r "necklace" of swollen vesicles or bladders which bear the con- 

 tacit-. Hookkr refers to the plant as a series of internode 

 (the Inflated portions) alternating with smaller narrower part 

 tnr n * The development, according to Griber (a), is from 



our apical cells. Branching commonly occurs at the internod 



xles. It is usuallv dichotomous. 



hut cases of trichotomy are common, and even polj 



I* 



base 



contains a central cavit\ 



l>e 



the 



Tht internode 



of an external mucilaginou- layer varying in thickn- 



the 



mule. This epidermi- 



Botanical Ottctte, vol. 58} 



(i) prefers to call 



l*©4 



