4(38 Transactions. — Botany. 



and figured for Callithamnion ternijolium. Too much stress, 

 however, must not be laid upon the occurrence of the ramuli 

 sometimes in threes, for this is a common character in the 

 genus {e.g., A. adnatum, A. cruciatum). The flagellate often once 

 dichotomised hairlike acuminate ramuli, perhaps, therefore, in 

 the present state of our knowledge, provide the best diagnoses 

 for the species. Hariot mentions the plant (No. 110) in his list 

 of seaweeds from Cape Horn, but gives no description. 



(Other species of Antithamnion occur in New Zealand, but 

 they have not yet been obtained in sufficient quantity for satis- 

 factory determination.) 



EXPLANATION OF PLATES XXIV.-XXXI. 



Plate XXIV. 

 Fig. 1. PtUothamnion peclvnatum, R. M. L. (Mont. ): Part of frond, showing 



tetraspores in tetrads • x 130). 

 Fig, 2. Part of frond, showing cystocarps in various stages ( x 130). 



Plate XXV. 



Fig. 1. QriffUhsia sondenana, J. Ag. : Tip of branch, showing young un- 

 divided tetraspores ( x 85). 



Fig. 2. Griffithsia antarctica, Harv. : .Showing involucral cup with escaping 

 tetraspores ( x 45). 



Plate XXVI. 

 Pandorea traversii, J. Ag. : Tip of branch, showing involucral cup with 

 escaping tetraspores ( x 45). 



Plate XXVII. 

 Fig. 1. Tip of frond of Pleonosporium hirtum, showing young, mature, and 



empty sporangia ( x 85). 

 Fig. 2. Tip of frond of Pleono* pari tun broiuiianum, Harv. -Gibson (Harv.), 



( X 85). 



Plate XXVIII. 

 Fig. 1. Tip of frond of Callitluimnion colensoi, Harv., with tetraspores. 

 Fig. la. Small portion of ultimate pinnule of the same ( x 270). 

 Fig. 2. Tip of frond of Spongoclonium pastorale, R. M. L, showing division 



of tetraspores and (a) a mature tetraspore escaped from the 



sporangium ( x 130). 



Plate XXIX. 



Fig. 1. Tip of thallus of Spongoclonium brachygonum, H. M L. (Harv.), 

 ( x 100). 



Fig. 2. Tip of thallus of Euptilota pellucida. showing cruciate tetraspores 

 ( X 130). 



Plate XXX. 



Fig. 1. Small portion of pinna of BaUia scoparia, Harv.. showing charac- 

 teristic spinous processes at the tips of the pinnules ( < iit>). 

 for comparison with Rhodocorton par keri (Harv. -Gibson). 



Fig. 2. Portion of a pinna of Antithamnion applicitum. II M. L (J. Ag.), 

 ( x 85). 



Plate XXXI. 



Fig. 1. AntithnnihiDii mtmitum, II. M. I.. (J. Ag.) : Tip oi 'lie pinna (x 340). 

 (The pinnules should be more fastjgiate and less divaricating.) 



Fig. 2. Antithamnion ternifolium, R. M. i . (Harv.) . Tip oi frond ( x 34C). 



