On the PithophoraceyE. * 63 



[P. snbvalida, filo princii)iill partis thalli cauloiile;e specimimmi t'ertiliiini c.-a 

 105 ,(( crasso, ramos unius vel diiorum ordiniiin emitteiite; ramis ordiiiis iirinii sin- 

 g-ulis vel (varius) binis oppositis; ramiis ordiiii; secnndi singulis; spni-is solitariis 

 (rarins g-eiuiiiatis), vel iucinsis vel tèrniinalibus ; sporis in vamis i)rinii oidinis in- 

 clnsis vel cylindricis vel orculsetbrniibns; sporis in filo prineipali incliisis plerumqne 

 forma subirregulari; sporis cylindricis c:a 6'd /.i. crassis et 88 ff longis, orculfefor- 

 mibus c:a 104 ^ crassis et 157 /( longis, subirregularibus 121 ,u crassis et 133 ft. 

 longis: sporis terminalibus plernmqiie subcouicis apice rotiindato, raro orcnlajfonuibiis 

 sursuni brevi-acuminatis apice subrotundato; sporis subconicis c:a (33 /( crassis et 

 155 ,« longis, orculaîformibiis c:a 95 ft crassis et 148 /.i longis.] 



Locality. Tbis species is fonnd in fresh water on Mangalore in Canara in 

 India, according to HoHENACKEK 1. c. 



General Description. F-SJ-tile specimens. Cauloïd part. In this many- 

 formed species we may distin^ish two types of ramification, one where only 

 the principal filament carries branches (which are consequently all of the l:st 

 degree), and one where the branches of the l:st degree are also ramified. In the 

 first type the branches are generally short and single (pi. 1, fig. 17); in the second, 

 the branches of the l:st degree are rather long and partly single, partly opposite 

 to each other in pairs, whilst the branches of the 2:d degree are short and single 

 (l)l. 1, fig. 13). Connecting forms between the two types exist, however. jMost fre- 

 quently the branches of this species are placed, as in the others, a space (however 

 small) below the top of the supporting cell, but not seldom the branches proceed 

 from the very top of their supporting cells (pi. 1, fig. 15, 17). Accessorial basal 

 branches are not rare, especially in specimens belonging to the second type of rami- 

 fication. Branchless cells in the principal filament are rare; even the top cells here 

 show, against the rule, now and then a tendency to ramify (pi. 1, fig. 17 ci). Only 

 one helicoïd I have found. It was unbranched, and belonged to a branch of the 

 2:d degree. — The spores, which are in this species of several different forms, are 

 ])artly inclosed and partly terminal. The inclosed are of three principal forms, viz. 

 1:0 cylindrical, 2:o cask-shaped, and 3:o of an irregular shape. As a 4:th kind 

 might be regarded the very short, half cask-shaped lower ones of the twin spores 

 (pi. 1, fig. 16 a"). The cylindrical, which are the most common, are found in 

 branches of the l:st and 2:d degree (pi. 1, fig. 13), the cask-shaped in branches of 

 the l:st degree and more seldom in the principal filament (pi. 1, fig. 16);. the irre- 

 gular in the principal filament (pi. 1, fig. 13). The terminal spores are of two kinds: 

 1:0 subconical with a rounded top (pi. 1, figs. 13, 15, 17), and 2:o cask-shaped and 

 abruptly narrowing towards the rounded top (pi. 1, fig. 14). The former is the 

 common form; the latter is rare. As I have already indicated, twin spores are not 

 seldom found. They are placed partly in the principal filament and partly in the 

 branches of the l:st degree. 



Rhizoïd part. Only in one of the examined specimens this part has been 

 preserved. It showed a very powerful development, being plui'icellular and spori- 

 ferous (pi. 4, fig. 19). 



Sterile specimens of this species would seem. to be very rare. Among the 

 numerous specimens I have examined, I have found only one sterile. This one had 

 strong and opposite branches of the l:st degree, and short and single of the 2:d. 



