Howe: MONOSPORANGIAL DISCS IN LIAGORA 7 
alleged to occur in Liagora. However, he believes the above 
explanation of the origin of the discs to be correct and ventures to 
publish his observations in the hope that some one more favorably 
situated, perhaps with access to living material, with facilities for 
cultural experiments, and with a taste for cytological investiga- 
tions, may be able to confirm or disprove them. The possibility 
that the discs represent an obligate epi-endophyte with a boring 
parasitic spore deserves special ideration 
THE NEW YorK BOTANICAL GARDEN 
Explanation of plate I 
The material from which the drawings on this plate were made was obtained 
from four species of Liagora, all collected by the writer at Montego Bay, Jamaica. 
I. Terminal cells of an assimilatory filament of Liagora ceranoides (No. 47784), 
showing enlargement and rounding of two cells preparatory to their division to form 
iscs. X620. (The relations of the branches have been somewhat disturbed and 
distorted by manipulation) 
2. Enlarged terminal cell of an assimilatory filament of L. ceranoides (No. 5034), 
showing gelatinization of apical portion of wall of original cell and formation of new 
wall for the rejuvenated cell. 
A young few-celled disc of L. valida (No. 4778c), still connected by mucus with 
the filament from the terminal cell of which it has apparently originated. 5 
4. Ayoung disc of similar size but with more numerous and smaller cells, the disc 
P obably representing a branch of the filament against which it lies (No. 4778c— 
A valida), xX 375. 
5 young disc showing its first reot-hair and connected by mucus with the 
filament from the terminal cell of which it was apparently derived (No. 477&c— 
L. valida). x 375 
- A young disc in L. a ee 5034), with a mucus connection with the 
end of the filament from thet f which it tly der ived. XX 375. 
7. Atwo-celled gemma in L. ceranoides (No. 47784) sibahik to te abjointed. 620 
8. A later stage in the development of asimilar gemma after detachment, the 
distal cell now divided into three cells and the proximal cell remaining undivided, 
forming a sort of stalk to the young disc (L. ceranoides, No. 4778d). X 6 
9. The terminal portion of an assimilatory filament of L. ceranoides (No. shri 
showing the formation of several unicellular gemmae or aplanespores in a more 0 
less concatenate series. “ee 
10. A supposed free a mae oe or unicellular gemma before its first division 
(L. cinsides: No. 4778d). Possibly, however, a spore from a monosporangium of a 
Matured disc X 510 
Tr. A young rites lled discin which all of the divisions appear to have been 
lengthwise of the mother-cell, with the first root-hair originating from near one of the 
Poles (No. 4778d). xX 510 
12. A young foie coliek disc in which the first division appears to have been 
lengthwise of the mother cell, followed by the transverse division of one of the 
daughter-cells (No. 4778d). X 510 
