BOTANY 



Coleochaete scutata, Breb. 

 Aphanothece prasina, A. Br. 

 Nostoc commune, Vauch. 

 Anabaena Hassalii, Wittr. 

 Cylindrospermum macrospermum, Kuctz. 

 Spirulina Jenneri, Kuetz. 



oscillarioides, Kuetz. 

 Oscillatoria amphibia, C. Ag. 



tenuis, C. Ag. 

 Sympluea muscorum, Gom. 



Symploea limosa, C. Ag. 



nigra, Vauch. 

 Phormidium autumnale, Gom. 

 Microcoleus terrestris, Desmaz. 

 Gloiotrichia natans, Rabenh. 



Pisum, Thur. 

 Batrachospermum moniliforme, Roth. 



vagum, C. Ag. 



ectocarpum, Sirod. 



Dillenii, Bory. 



MARINE ALG^E 



The flat muddy coast of the county, without any natural rocks 

 capable of affording a stable anchorage, is not a favourable locality for 

 seaweeds, hence the list of Essex seaweeds is not large. 



A list of the marine algae of Essex has been compiled by Mr. 

 E. A. L. Batters, chiefly from the herbarium of Mr. G. P. Hope, 1 and 

 it is from this source that I have obtained the following list. A few 

 species are added from a list of seaweeds quite recently collected by 

 Dr. H. C. Sorby and named by Mr. E. M. Holmes. 



So far as is at present known the marine flora of Essex consists 

 of 158 species included in 95 genera, and is marked as much by the 

 absence of many species common and abundant elsewhere as for the 

 presence of a few which are very rarely met with on the shores of our 

 islands. As examples of the latter class, Ectocarpus erectus, Phyllitis 

 Jiliformis, Scinaia furcellata and Grateloupia Jilicina may be mentioned ; 

 while as examples of the former, Calotbrix confervico/a, Desmarestia 

 acu/eafa, Dictyosiphon fceniculaceui^ Asperococcus echinatus, Spbacelaria 

 cirr&osa, Chordaria Jiagelliformis, Leatbesia difformis^ Laminaria digitata^ 

 Saccorhiza bulbosa, Pehetia canaliculata^ Chantransia secundata^ Gelidium 

 crina/e, Gigartina mammillosa, Callopbyllis /aciniata, Lomentaria c/ave//osa, 

 Nitophyllum punctatum, Ceramium echionotum, C. acanthonotum^ C. ci/iafum, 

 Polysiphonia fastigiafa, all of them common species, are ' conspicuous by 

 their absence ' from the flora of Essex. 



The marine flora of Essex is southern in its character. The 

 following have been recorded : 



Gloeocapsa crepidinum, Thur. 

 Aphanocapsa marina, Hansg. 

 Dermocarpa prasina, Born. 

 Hyella caespitosa, Born. & Flah. 

 Spirulina subsalsa, CErsted 

 Oscillatoria corallina, Gom. 

 Lyngbya semiplena, J. Ag. 



aestuarii, Liebman. 

 Symploea hydnoides, Kuetz. 

 Microcoleus chthonoplastes, Thur. 

 Calothrix scopulorum, C. Ag. 



pulvinata, C. Ag. 



- confervicola, C. Ag. 

 Isactis plana, Thur. 



Rivularia atra, Roth. 

 Mastigocoleus testarum, Lagerh. 

 Anabaena variabilis, Kuetz. 

 Chlorochytrium inclusum, Kjellm. 

 Monostroma laceratum, Thur. 

 Enteromorpha ramulosa, Hook. 



- erecta, J. Ag. 



clathrata, C. Ag. 



canaliculate, Halt. 



percursa, Harv. 



compressa, L. 



intestinalis, L. 



- Linza, J. Ag. 



tubulosa, Kuetz. 



1 Enex Naturalist, viii. i, and species recorded by E. M. Holmes in the same publication. 



59 



