35 



44- C. imbricata, as above mentioned, is C. equijetifolia, T. 54. 



45. C. coccinea. T. 36. 



46. C. pennata. T. 86. 



47. C. parafttica of Englifh Botany, t. 1429, and of my Synopfis. 



48. C. ttgagrophila . T. 87. 



I am proud to acknowledge the flattering manner in which moll of 

 thofe Botanifts who are diftinguifhed by their knowledge of the fubmerfed 

 Algae have affifted me in this work. Mr. Turner in the moft friendly manner 

 has exerted himfelf to procure and give me all the information in his power, 

 and to him I am indebted for the descriptions of C. arbufcula, agagropbih, ortho- 

 trichi, and pellucida. Sir Thomas Frankland, Bart, and the Rev. Hugh Davies, 

 have obligingly communicated fome authentic fpecimens in their poffeffion, 

 and thereby enabled me to fix the fynonymy of feveral of Hudfon's fpecies, 

 with greater certainty than would otherwife have been poffible. To James 

 Brodie, Efq. Jofeph Woods, junr. Efq. William Jackfon Hooker, Efq. William 

 Borrer, junr. Efq. Mifs Hutchins, and Mr. William Wefton Young, I am in- 

 depted for the difcovery of many new fpecies, and I am (till further indebted 

 to Mr. Hooker and Mr. Woods for feveral beautiful drawings with which they 

 have favored me, nor muft I omit to acknowledge the fcrvice which that part 

 of my undertaking has received from the profeffional talents of Mr. Young. 

 I have alfo to thank Dr. Turton for his readinefs at all times to affift me. To 

 the Right Hon. Sir Jofeph Banks I am under great obligation for the free accefs 

 which he has allowed me to his invaluable Library and Herbarium ; and to Dr. 

 Williams, Profeffor of Botany, at Oxford, for the opportunity he has liberally 

 afforded me of examining the fpecimens in the Dillenian Herbarium. 



e 2 



