THE PLUMUI.ARID/E. 



55 



KKY To SI'KCIES DK PLUMULARIA. 



Intermediate intrrnodes short, each bearing a single nematophore; 

 hydrotheca'. not distant; gonaugia very long, with a tubular 



"neck' 1 ..-- - /' netacea. 



Intermediate internodos longer, each with two nematnphores ; hydro- 

 theca- distant, borne near center of iuteruodes; hydranths very 



j. ir , re ./*. moff&locephttltt, 



llydrotheca- near distal euds of internodes; no supracalyeine nemato- 



Hydrocladia composed of alternating phores; hydroeladia short P.oUi/opysii. 



hydrotbecate and intermediate inter- J Hvdnttb.^;,. near distal ends of internodes; no neinatophores on inter- 

 nodes, divided by straight nodes. Seta- mel iiate internodes; supracalyciue uematophores absent.. . /'. lielleri. 



ceo Group. Like p failed but with much longer internodes /'. al/itlieca. 



Internodes and hydrotheea- much as in P. megalocepliala; hydranths 



smaller; colony with lateral branches ..P. Jiliciila. 



Hydrocladia aunulated at the iuteruodes; hydrothecai as in eathannu 



group p - floriilana. 



Internodes of stem conical in front view ; hydrotheca with posterior 

 , corrugation P.filU-aulis. 



Hydrocladia opposite, not directed forward; nodes pronounced and 



alternately straight and oblique p - catharina. 



Hydrocladia composed of hypothecate H lrocladia opposite, often directed forward ; colony branching dicho- 



and intermediate internodes, divided tomou8ly; no( les distinct P. geminala. 



by nodes which are alternately straight Hydrocladia oppos ite, directed either forward or laterally : nodes often 



and oblique; cauline hydrotheca- pres- ' illllistiuct P. clarkei. 



eut. Catharina Group. Hydrocladia alternate; stem made up of two kinds of iuternodes. 



/'. ulternata. 



Hydrotheca' near distal ends of internodes; nodes on a level with the 



tops of hydrotheca-. P. plumularioides. 



Hydrotheca- near distal ends of internodes; nodes above level of top ot 

 hydrotheca- ; stem slightly genk-ulate ... ? inermii. 



Hydrocladia composed of hydrothecate A uliar nema tophorf ou the process of stem from which the hydro- 



internodes only. Jlleiiuata Group. cladia arise... '' ''""'' " leoa - 



Hydrotheca? on enlarged proximal ends of iuternodes P. ulleiniata. 



Two hydrocladia to each interuode of the stem; nematophores mouo- 



thalamic ..P.gooM. 



Iuternodes with septal ridges; hydrotheca- not wider than deep; colony 



Hydrocladial internodes with strong sep- dendritic, strongly bram-hed - - p - forriujata. 



tal ridges; or hydrocladia with more Hydrothec.-e not wider than deep ; colony not branched. . ..P. palmvri. 



than one intermediate internode. La- I H yd r otheca' wider than deep P. lagenlftra. 



ycnifera Group. [ Jjo intermediate iuternodes ? i'irf/iinK. 



Intermediate iuternodos present and bearing nematophores. 



P. mactretheca. 

 Two or three deep aunulations between hydrotheca-; hydrotheca 



Hydrothecu- more than H times as deep sep ., rated by about their own depth .-P. dendritic,!. 



as wide. Uacrothei-a Group. ^ intermediate interimdes; each internode with one hydrotheca; no 



deep annulations . . - P - profunda. 

 More than one hydrotheca to each iuternode P. paitemoda. 



