156 
THE SEAWEEDS 
A. Cells of the intermediate stratum very large, the cortical cells in 
simple vertical series. Frond terete, dichotomous, about 25 cm. high. 
1. Cystocarps terminating the ramuli M. terminalis 
Harvey. 
2 Cystocarps occupying the whole of a small 
ramulus M - memlranacea 
Harvey. 
3. Cystocarps spherical, sessile on the lesser 
segment M - carnosa 
Harvey. 
B. Cells of median stratum large. Cortical cells in dichotomous 
fastigiate series. 
a. Frond terete. 
4. Dwarf, 5 cm., spreading on all sides M. pusilla 
(Harvey) J. Agardh. 
5. Small, 10 cm., fastigiate M. fastigiata 
(Harvey) J. Agardh. 
6. 15 cm. to 30 cm. long. Ramuli lateral, sub- 
secu'nd, uncinate, tangled M. hamata 
Harvey. 
b. Frond compressed. 
7. 20 cm. to 40 cm. Long sub-distichous pinnate 
branches to 10 mm. broad M. compressa 
. Harvey. 
M, nigrescens 
(Ilarv.) J. Agardh. 
M. disticlia 
Harvey. 
These species are difficult to distinguish and are not satisfactory. 
c. Frond flat, linear or cuneately dilated, flabellately expanded. 
8. M. foliosa (Harv.) J. Agardh. 
The following species of Mychodea have been collected from the localities 
given below in South Australia : — 
M. carnosa Harvey. Eastern Bays. 
M. hamata Harvey. Encounter Bay, Eastern Bays. 
M. compressa Harvey. Investigator Strait, Eastern Bays. 
M. nigrescens (Harv.) J. Agardh. Investigator Strait, Eastern Bays. 
M. disiicha Harvey. Investigator Strait, Eastern Bays. 
M. foliosa (Harv.) J. Agardh. Eastern Bays. 
M. linearis J. Agardh. Fowler ? s Bay. 
