90 
SUMMARY OF CURRENT RESEARCHES RELATING TO 
chondrophyllum, and places it in tlie tribe Polysiphonieae of Rhodome- 
lacere. The following is the diagnosis of the genus : — Thallus forming 
a very short spherical primary shoot, from which ^spring flat moderately 
stiff-branched dorsiventral secondary shoots, cartilaginous, consisting of 
a polysiphonous axis and 15-20 pericentral cells. Cystocarps spherical, 
shortly stalked, on the inner side of the secondary shoot ; antherids in 
a similar position to the cystocarps, forming an ovoid or catkin-like 
shortly stalked mass ; tetraspores in a similar position, in dorsiventral 
septated sticliids, divided tetrahedrally. A peculiarity of the plant is 
that sexual organs in all stages of development are found on the same 
individual at the same time. It has no attachment-disc, the organs of 
attachment penetrating deeply into the host-plaut. 
Laminaria ceae.* — Prof. W. A. Setchell gives a resume of the general 
structure of this family of Phgeosporege, and a proposed classification of 
the nineteen genera now included in it under three tribes, as follows : — 
(1) Laminariideae : — Fronds simple (except in Thalassiophyllum ): — made 
up of two sub-tribes, Laminariege {Chord, a, Saccorhiza , Laminaria ), and 
Agareae {Cymathsere, Costaria, Agarum , Thalassiophyllum , Arthrothamnus). 
(2) Lessoniideae. Frond compound ; new blades arising from the old by 
a splitting process at the transition-place : — two sub-tribes, Lessoniege 
( Dictyoneuron , Lessonia , Postelsia , Nereocystis ), and Macrocysteae ( Macro - 
cystis). (3) Alariideae ; Frond pinnately compound ; sporophvlls arising 
as outgrowths at the transition-place: — three sub-tribes, Eckloniege 
( Ulopteryx , Echlonia , Eisenia) ; Egregieae {Egregid) ; and Alarieae ( Ptery - 
gophora , Alaria'). 
Chlorophores of Spirotaenia obscura.j — Dr. J. Liitkemuller states 
that in young specimens of this desmid the chlorophores do not consist 
of parietal bands, as in S. condensata , but resemble essentially those 
of Penium. A central band, with a row of pyrenoids, passes through 
the entire length of the cell, and gives off towards the cell-wall lamellae 
which are twisted spirally and thickened outwards. The structure of the 
cell-wall and of the gelatinous envelope agrees with that of S. condensata. 
Epiphytic and Endophytic Chaetophoracese4 — M. J. Huber gives an 
exhaustive account of the endophytic and epiphytic genera and species 
of Chsetophoraceae. The epiphytic genera are six, viz. : — Endoclo- 
nium, Herposteiron , Ochlochsete, Pringsheimia , Ulvella , and Chsetopeltis. 
Endoclonium is very nearly allied to Stigeoclonium , and several species 
included by authors under the former must be referred to the latter 
genus. Braun’s genus Aphanochsete must be sunk in Nageli’s earlier 
Herposteiron. Ochlochsete resembles Herposteiron , with the hairs trans- 
formed into bristles ; 0. dendroides is probably identical with Phseopliila 
Floridearum. A new species 0. ferox is described epiphytic on Chaeto - 
morpha Linum. Ulvella is destitute of hairs, and is nearly allied to the 
Ulvacese ; Chsetopteris exhibits an affinity with the Trentepohliaceae. 
The endophytic genera are eight, viz.: — Chsetonema , Acrochsete , 
Bolhocoleon, Gonatoblaste g. n., Endoderma, Phseopliila , Blastophysa , and 
Chsetosiphon g. n. Acrochsete has not the sheathed hairs which have been 
* Trans. Connecticut Acad., ix. (1893) pp. 333-75. 
t SB. Zool.-Bot. Gesell. Wien, xliii. (1893) pp. 38-9. 
t Ann. Sci, Nat. (Bot.), xvi. (1892) pp. 265-359 (11 pis.). 
