N 
—. 
2 PROFESSOR LINDLEY'S CONTRIBUTIONS TO 
herbarium, a specimen has lost a part of its pollen-masses, as is 
frequently the case with E. muscicola, Dalzelli, &c., its true genus 
may still be determined. It is mainly because Sarcostoma has the 
pyriform pollen-masses of an Eria, although their number is that 
of Dendrobium, that I now hesitate to reduce it to the latter genus. 
In forming the sections now proposed, it will be seen that a 
regular sequence of the most nearly allied forms is not wholly ob- 
tained. However desirable, indeed, such an arrangement may be 
in theory, it is certainly unattainable in practice in cases where 
great numbers of species are brought together; for the points of 
resemblance and difference are so various and complicated, that, 
like countries in a geographical map when placed in a continuous 
series, some must of necessity be dissevered from those to which 
they are conterminous in nature. Thus the Bolbodia, forming a 
natural group among each other, run into Stachyobiwm as much 
as into Hudendrobiwm, next which the section is placed; and such 
species as D. Dalhousieanum are much allied to the Holochrysals. 
It would, moreover, be desirable to collect into one subdivision 
such species as D. exciswm, metachilinum, Tmesipteris, lycopo- 
dioides, &c., now forming a part of Eudendrobium ; but I do not at 
present see what combining characters are available for the purpose. 
The following Table brings into one view the distinctions of the 
groups under which the annexed memoranda are collected :— 
Folia verticalia (scalpellifolia) ........................... 1. APORUM. 
——— teretia ..... eee eee ee eee esee eese oe see eset eset зев... 2. STRONGYLE. 
horizontalia. 
Caulis nullus, rhizoma tantum ............... "АРТУ, 3. RHIZOBIUM. 
apice tantum 1-3-phyllus. -Folia coriacea... 4. DENDROCORYNE. 
а. labello continuo. 
b. labello in crinibus soluto (Desmotrichum). 
Caulis undique foliatus : 
Flores omnino aurei ............................—у.. 5. HoLocurysa. 
—— rosei aut candidi, labello tantum quandoque 
luteo. 
Mento nullo................ eee 6. ACLINIA, 
—— producto : 
Flores fasciculati aut solitarii : 
a. Caule brevissimo, conico (Bolbodium). 
b. Caule elongato ......... АА 7. EUDENDROBIUM. 
Flores dense racemosi, mento elongato 8. PEDILONUM. 
Flores laxe racemosi, mento brevi : | 
petalis conformibus ..........:..... .. 9. STACHYOBIUM. 
petalis elongatis spathulatis .........10, CERATOBIUM. 
