10. 
eT. 
: 
131 
Minute filamentous epiphytes of extremely small size forming 
discs or patches on the surface of other algae, Flusiva, etc. ; 
reproduction by monospores cut off by a curved wall arising 
within a thallus cell ate eee ae nee 3% cae ny 3G 
Discs made up of clearly recognisable filaments free from 
one another at their apices re al) LEVUINVOCLAGIG” 33.05 7a 
Discs made up of confluent filaments forming pseudo- 
parenchyma with an entire margin ae Evythropeltis ...p. 76 
Free filaments more than quarter inch in length ... bisle Soo AE 
Free filaments less than quarter inch inlength ... wee se 
Thallus with a basal layer from which arise free vertical threads 
with cruciately divided hee in the course of the 
filaments ... sae es boc i Petrocelis ...p. 101 
Thallus similar to above but with short tapering vertical 
filaments united into a pseudo-parenchymatous layer, but 
readily separable under pressure; cruciately divided tetra- 
spores terminal on short filaments interspersed among the 
rest ase ‘ ae ... Cruoriella ...p. 101 
Thallus Pe ictaly aisebed to ie substratum, formed of minute 
cells united into pseudo-parenchyma, not separable under 
pressure; tetraspores cruciately or zonately divided, in 
conceptacles buried in the thallus but opening to the surface 
by a pore aici ... Hildenbrandtia... p.102 
Thallus with a hascat Poe fom which arise vertical Griese 
12-30 cells long ; not readily separable under pressure, giving 
tise above to sori of cruciately divided tetraspores and 
paraphyses oo 366 aoe ... Rhododermis... p. 104 
Thallus of very fine unbranched filaments attached singly to the 
substratum II 
Thallus of fine sopenre! Siemens “nisms suemeee Seguros: 
with or without a system of irregular delicate filaments 
clothing the cells of the main axes sie sine Bae : 12 
Thallus of branched filaments, originally monosiphonous Bae 
becoming polysiphonous by longitudinal division of cells of 
main axes, or by cortication in various ways so that ultimate 
branches or apices of main axes alone show the emanate 
condition ... are oe sie cee ae an SEpe. 738} 
Thallus of various forms, cylindrical, compressed or Vananate 
but not obviously monosiphonous Ser sks Se Boo ee 
Filaments monosiphonous ... Jee ... Erythrotrichia ...p.76 
Filaments becoming polysiphonous but with cell groups arranged 
in bands of greater width than length ... --. Dangia ...p.76 
. Cylindrical branched algae, very gelatinous and worm-like ; 
built up of numerous monosiphonous filaments, longitudinally 
and radially arranged, more or less separable under pressure 36 
