< 0LLIN8 \\l> ill RVET. 



thin ;iih1 membranaceous to coarse and leathery ; the dark, eonate 

 lines are distinct in the thin, light colored Form, imperceptible <>n the 

 old, coarse and dark fronds. It differs much in the extent of division 

 of the fronds, from broad-cuneate and little parted, to fronds consisting 

 of Innumerable narrow divisions, sometimes broad below, narrow 

 above, always more or less cuneate with apex truncate. Underwater 

 it shows a very brilliant Iridescence of peacock blue and green. 



I'adixa Adans 



on. 



i. Epidermis persistent as an induaium over the spores. 2. 



l. NO induaium; spore band in middle of each Becond eone between bands 



of hairs. i. I'. gymnoepora. 



2. Frond dark and thickish, not much calcified; in middle part "J :\ cells 

 thick; hands of spores alternating with hand- of hairs. 3. I', variegata. 

 2. Lighter colored and thinner; distinctly calcified. 3. 



'A. Band of spore- above each second band of hairs; frond normally '2 cell- 

 thick. 1. P. Barictae-crucis. 

 3. One hand of spores above and one below each Becond band of hairs; frond 

 normally 3 cells thick. 2. P. Pavonia. 



1. P. SANCTAE-CRUCis Borgesen, 1914, p. 201, figs. 153 154; 

 P. B.-A., No. 2082. Harris Bay, -Ian., Nov., Hervey; Shelly Bay, 



April, Jew's Hay, Ely's Harbor, Hungry Bay, .Inly, Gravelly Bay, 



Anil., Collin-. A rather thin, delicate species, growing mostly in 

 -hallow, (piiet water. The color is usually a quite light yellowish 

 brown on the upper side, the under side being usually covered with a 

 continuous hut quite thin calcareous coating, white or bluish in color. 

 The dried plant is papyraceous and brittle. Only tetrasporic fruit 

 ha- been found, which was on plants collected in July and August 

 The indusium consists of the epidermis, which is pushed up by the 

 spores a- they -row, and finally ruptured; being very thin and trans- 

 parent it is not always easy to make out, but it often happens that 

 when it i^ pushed away from the frond, it retain- the markings out- 

 lining the layer of cells beneath; in such ease a fine network corre- 

 sponding to the cells can be seen with the mieroseopo by careful 



focusing, on a level with the top of the spores. This form of Indusium 

 ha- been noted in Zonaria variegata by Sauvageau, 1905, p. li (of 

 reprint.) 



I'. Pavonia I.. Gaillon, 1828, p. 371; Harvey, 1846 51, PL 

 XCI; P. B.-A., No. 2081; Fucvs ijucuuiils Linnaeus, 1763, p. 1G3U. 



