116 GIGARTINACEAE 
Pilger, described* as parasitic on Rhodymenia sp. from South Chile, 
shows that the cushions are an organic part of their supposed host, 
and that, with little doubt, they represent the tetrasporic nema- 
thecia of some species of Stenogramma. А query on the label indi- 
cates that this possibility had already been recognized by Dr. 
Pilger himself. 
PLATE 43. Actinococcus mollis 
he photograph shows three or four cushions, natural size, on Gymnogongrus 
disciplinalis (Coker 05 p.p.—from liquid preservative). 
CALLOPHYLLIS Kiitz. Linnaea 17: 102. 1843 
CALLOPHYLLIS CHILENSIS (J. Ag.) Okam. Alg. Jap. 
Ехвісс. 12. 1899. (Excluding specimen) 
Microcoelia chilensis J. Ag. Sp. Alg. 31: 227. 1876. 
Attached to Rhodymenia corallina in beach drift, La Punta, 
region of Callao, January 25, 1907, Coker 30 p.p. (PLATE 32, 
FIGURE B); three tetrasporic plants, the largest 10 cm. in maximum 
width. 
The specimen described by J. Agardh was collected on the 
shores of Chile by W. H. Harvey and according to Agardh was 
"Nomine Kallymeniae а Harveyo inscripta." We have seen 
only a photograph of J. Agardh’s actual type, which was cysto- 
carpic, but, through the courtesy of the officials of the Royal 
Botanic Gardens, Kew, we have been able to make a microscopic 
examination of both tetrasporic and cystocarpic specimens of а 
“Kallymenia” collected by Harvey in Chile and agreeing essen- 
tially with J. Agardh’s description of Microcoelia chilensis. From 
these data and from J. Agardh’s excellent description, we feel 
justified in considering Dr. Coker’s specimens to be young small 
thin tetrasporic individuals of the remarkable species for which 
the generic name Microcoelia was proposed. 
The following description applies only to Dr. Coker’s plants, 
but could probably be made to hold true of the species as a whole 
by a few modifications, such as allowing a greater thickness for 
the thallus, greater dimensions for the large medullary cells, etc. 7 
* Hedwigia 48: 178. pl. 7. 7. В (1-5). 1908. : 
T In the plants at Kew referred to above the thallus is 320-5о0и thick and the 
large medullary cells measure 165-3204 X65-1704g. 
