48 Verr BrecHer WirrrRock. 
phologically, not physiologically) rhizoid part, developed from 
the germinated spore downwards, almost always sterile and 
branchless, commonly unicellular. Spores neutral, quiescent’ 
(agamo-hypnospores), generally cask-shaped, single, formed by 
division into two of the cauloid cells, of the chlorophyll-filled 
and commonly widened upper parts of these cells; in germi- 
nating as a rule dividing into two cells, the one giving rise 
to the cauloid and the other to the rhizoid part of the thallus. 
[Pithophoracee nob. Algee (aque dulcis) chlorophyllacez, clado- 
phoroidez, e seriebus cellularum bipartitione cellule terminalis genitis 
exstructe. Thallus a duabus partibus distinctis constitutus: l:o parte 
cauloidea, e spora germinata sursum evoluta, propagativa, semper (fere) 
ramosa, ramis e cellulis suffultoriis paullo infra apicem egredientibus; 
2:0 parte (morphologice non physiologice) rhizoidea, e spora germinata 
deorsum evoluta, semper fere sterili et simplici, plerumque unicellulari. 
Spore agamee, quiescentes (= agamo-hypnospore), sepissime orcule- 
formes, solitarie, bipartitione cellularum partis thalli cauloidee formate; 
(cellule singule, matres sporarum, parte superiore tumefacta et contento 
chlorophyllaceo farcta, sporas singulas et cellulas singulas steriles sub- 
sporales gignunt). Spores germinantes in binas plerumque cellulas divise, 
cellula altera in partem thalli cauloideam, altera in partem thalli rhizoideam 
denique evoluta. | 
GENUS PITHOPHORA nob. 
Character the same as that of the order. 
Sectio I. PITHOPHORA ISOSPOREA: 
Spores all of the same principal form in each species; the m- 
closed either cylindrical or cask-shaped, the termmal either cylindrical 
or cask-shaped with the upper end conical and the top somewhat rounded. 
(Species 1 to 5). 
Species 1. Pithophora sumatrana (v. Mart.) nob. 
Synon. Cladophora sumatrana v. Mart. Die Tange, pag. 20, pl. 2, fig. 2. 
Diagnosis: Principal filament of the cauloid part of the thallus in 
fertile specimens on an average 127 w'*) thick, with branches only of the 
1) The numbers in the diagnoses are all average numbers, gained by com- 
parison of a great number of measurements. 
