seen a sporangial slalk bearing more than one sporanginni , and a renewal of an 

 emptied sporanginni within the sporangial-wall from tlie stalk-cell has not been 

 observed, but a new sporangium may sometimes be developed beside an emplied. 

 Colourless hairs are always present; they are terminal or lateral, in the laUer 

 case, however, certainly always originally terminal. 



Localities. Bm: Gyldeiiloves Flait, QR, 7,;') metcis, on Polijsiphonia niolacea, .IuIn'. BIc SO, 

 S. of IJroens Rev, 8,5 meters, on Polysiphonia clongata, August. 



5. (Jhaiitransia moiiilif'onnis sp. nov. 



Thallns minutus csespitulosus, 50 — 150/^ altus vel parum ultra (sine pilis). Cel- 

 lula basalis singula subglobosa, fila 2 — 3 (vel plura?) erecta vel decumbenlia et 

 adscendentia, a basi ramosa, e cellulis plus minus inflatis constituta, emitlens. Cel- 

 lulse diametro sequilongse ad duplo longiores, plerumque 

 fere sesquilongse, subglobosee aut doliiformes vel in parte 

 superior! incrassatte, 7 — 10 m latjie, 7 — 14 « longa?. Chro- 

 matophorum steiliforme, pyrenoide centrali instructum, 

 in parte superior! cellulse situm. Fila ramique, prteci- 

 pue in statu juvenili, ssepe piligeri, pilis initio termi- 

 nalibus, dein evolutione sympodiali (pseudo-)lateralibus. 

 Sporangia monospora sessilia, rarius pedicellata, late- 

 ralia, secundata vel opposita, ovata , 13,5 — 15/7. longa, 

 7 fj. lata, post evacuationem saepe sporangio novo, 

 e cellula subjacenti orta , repleta. Organa sexualia 

 ignota. 



This small species is easily distinguishable from 

 the other species of this group by its short, more or 

 less swollen cells, which in juvenile plants approach 

 to the globular form, while in older iilants they are 



1 ^ Chantransia moniliformis. Young plants 



almost barrel-shaped. The basal cell which is fixed to with hairs, a ivom Heisingor, r and c 

 the host plant by a thin layer of cementing substance from d. 390:i. 



is scarcely ditTerent from the other cells in form. The displacement of the origi- 

 nally terminal hairs is easily to be seen in the young plants (fig. 28 C); in older 

 plants no hairs are to be found. In the plant represented in fig. 28 B the cell si- 

 tuated beneath the upper terminal hair-cell had lengthened and become almost 

 colourless, approaching thus to the character of a hair-cell; but this case appears 

 to be very rare. The branches are mainly given oil" at the upper side of the de- 

 cumbent or ascending principal filaments, and this holds good also of the sporangia 

 which are often seriate on the upper side of the filaments. After the evacuation 

 the sporangial wall is seen to be lamellate, but the acroscopic part of it is often 

 dissolved (fig. 2y fi). — On dried material 1 once saw a specimen with a blue-green 

 colour; unfortunately I have not examined the species in the living state. 



13* 



