TIIK SKKTI'LAKIUJS. It 



KEY Til THE AMKlile AN S]'K( I ]> ill TIIK (iKXI'S SEHT1 I.AUK1.I.A 



Ilydrothec-e with fmir teeth. 



Hydrotheca] walls marked by annular rugosities. 

 Kngosities "ii upper side df hydrolhecic only. 



Hydrothec;e large, stem fascicled r/m/i. 



Stem in it fascicled. 



Hydrothecse distinctly narrowed distal ly a mien. 



Hydrothec.-e not distinctly narrowed distal ly i-nl, ,,u. 



Rugosities on all sides of hydrothecal walls. 

 No distinct neck to the hydrothec;r. 



Ilydrothecie (itmdrate in en >ss section i/nmlrn/n. 



Hydrothecse nuind in cross section. 



Hydrotliec:c very large Inn HIT!. 



Hydrothec.-e not very large. 



Hydrothec;i distant, rugosities not very deep </, iiii-n/nlii. 



Hydrothec.-e approximated, rugosities very deep /mlni/nnim. 



A distinct square neck to the hydrotheca. 



Ilydrothecie largely immersed, closely approximated rtit/nxn. 



Hydrothecse cxserted, not closely approximated. 



Hydrothecie with two very distinct rugosities untii. 



Hydruthene with several less distinct rugosities I, in:lln. 



Hydrothecal walls smooth, without regular rugosities. 

 Marginal teeth distinctly of unequal size. 



Ilydrothec.-i' inclined forward nil muni. 



Hydrothecie not inclined forward in noticeable decree miilnrln. 



Marginal teeth of approximately eijual si/.e. 



Entire adeauline wall adnate to hydrocaulus. 

 Hydrothecse closely approximated. 



Colony of very thin hyaline structure lain. 



' Colony of thick corneous structure nllm. 



llydrothec;i- distant, stem fascicled below y/i/im;/, rn. 



IIydi'othec:c distant, stem not fascicled iliistniis. 



Practically the entire adeauline wall free ri/limli-illiirn. 



Less than mie-third of adeauline wall adnate. 



1 1 yd nit here CM ion nous, margins reduplicated i/ii/nnlin. 



IIvdrothecM' not extraordinarily lar.L'c-. 



Hyd rot hec; i cylindrical "///An/Vra. 



Hydrotheca smooth and its internode fusiform fiixlfnnnix. 



Ilydnithec;e rugose, pcdiculate .111/1111 rin. 



Hydrothec;e swollen below. 



Hydrothec;e dislanl. ^niian^ia relatively lar^c pirta. 



II yclrothee;e not distant, gonangia small ///.</" ''""". 



Between unc-third and three-fourths of adcauline wall adnate. 

 About one-half of adcauline wall adnate. 



Teeth well marked jn,/i/:niiinx. 



Teeth very shallow i-lnnsn. 



About two-thirds of adeauline wall actuate COmpleXd. 



Hydrothc'ca- with three' tei-th. 

 Teeth of iiiiecjnal si/.e. 



llydrotheca- inelined forward, niarnin llariii}; /liiinnln. 



1 Iydrothec;c not inelined furward, margin llurin:.' ' maTga/ritacea. 



IIydrothec;e not inelined forward, margin not flaring 

 Teeth of eijual si/.e. 



1'istal part of hyilrothecin narrowing to oriticc. 

 Arranjienient of hydrothec.-c \cry irregular 

 Hydrother;e fairly regular. 



Branc'hing diehotomous, c'oloiiy stra^L'ling KtilnHrli<>li>iiin. 



Branching alternate. 



Hydrotheea- with oblii|Ue internal marking jiUjfnniu.-. 



llydnithcc.-c without oblique markiiii; ..ijiinili-iilmtr. 



]>istal portion of hydrothec.e expanding, 



<ionangia large, distal jiortion ttirreted - iin-i-iiliniin/iti. 



Gonangia smaller, with very conspicuous flaring frills eltyans. 



