Marine Plants of Nha Trang — Dawson 
425 
LOCAL DISTRIBUTION: Forming loosely ad- 
herent, partially free crusts on coral, Sta. 7 
( 11238 ). 
This species is distinguished by its loosely 
attached habit, its multicellular rhizoids, and 
ascending peri thallium cell rows. It is quite 
brittle when dry, and dull in color. It is more 
heavily calcified than Australian examples I 
have seen. 
Peyssonelia calcea Heydrich 1897: 10 (Tami 
Island, New Guinea); Weber van Bosse 
1921: 277, fig. 94; Dawson 1953: 107 
Fig. na 
LOCAL DISTRIBUTION: Qustose, on coral 
fragments, Sta. 1 (11071). 
These specimens are in good agreement 
with the species as known both from the 
Indonesian region and from Socorro Island, 
Mexico. They are heavily calcified, 500 
thick, yellow brown in color, with intercellu- 
lar spaces between the decalcified perithallium 
cells, numerous unicellular rhizoids, and con- 
Fig. 35. Wurdemannia minlata: Habit of part of a 
plant extracted from a tuft with small bits of Hypnea 
attached at points A and B, X 5. 
Fig. 36. a, h, Htldenbrandia prototypus: a. Minute, 
angular vegetative cells of the thallus as seen in surface 
view, X 350; b, a tetrasporangium 30 ju long showing 
the irregular divisions, X 350. c, Peyssonelia rubra var. 
orientalis: A small portion of a sterile thallus in vertical 
section showing the unicellular rhizoids and erect peri- 
thallus cell rows, X 180. d, Peyssonelia gunniana: A small 
portion of a sterile thallus in vertical section, X 200. 
spicuous heterocysts among the small super- 
ficial cells. 
Fosliella farinosa (Lamx.) Howe 1920: 587. 
Melohesia farinosa 'Ldimomoux. 1816: 315, pi. 
12, fig. 3 (Europe); Lemoine, in B0rgesen 
1917: 170, fig. 165 
Fig. 37c 
LOCAL DISTRIBUTION: On Sargassum, Sta. 3 
(11169). 
These plants have tetrasporic conceptacles 
150-200 fjL in diameter and seem better re- 
ferred here than to Fosliella paschalis (Lemoine) 
Setch. & Card. The heterocysts are con- 
spicuous. 
Hydrolithon reinboldii (W. v B. & Fosl.) 
Fosliel909: 55. Lithophyllum reinboldii Web- 
er van Bosse and Foslie, in Foslie 1901: 5 
(Indonesia); Weber van Bosse and Foslie 
1904: 49, fig. 21, pi. 10, figs. 1-6 
Fig. 1>lh 
LOCAL DISTRIBUTION: On stones, Sta. 3 
( 11211 ). 
