190 EETURX TO ENGLAXD : AND VISIT TO PARIS 
Such scrubs as that Pol[^jsip]ionia] [he declares to Harvey] 
are rather iiifra dig. for an ' officer and a gentleman.' Cannot 
you spare some of those dandy Delesseria, or some showy 
things that will require a whole red plate ? I do hate too 
much of this sort of thing, but I think they ought to come 
in. (April 14, 1845.) 
Harvey carried out his wishes, for not only is there a 
Pohjsi'pJionia Davisii, but two Delesserias are named D. 
Dauisii and D. Lyallii. 
Meantime details are scrutinised ; carelessness about species 
ruthlessly exposed. D'Urville's collection assigns a certain 
Alga to Lord Auckland's Island, where it was inconceivable 
that Hooker and Lyall should have overlooked it. He reminds 
Harvey how he proved in Paris that specimens were wrongly 
ticketed, and as for the so-called species itself {Bhodomenia 
ornata), wdiich Brown enters as Ballia Homhroniana, ' I am 
convinced,' he writes, * of its being no species at all, and long 
to restore the name callitricha, but '* am not game " ! ' 
Similarly, in an undated letter of 1845 : 
I am now hammer and tongs at my Lichens, w^hich are 
an Augean stable. The British species are humbugged by 
the introduction of varieties ; if ever I publish an Ed. of 
Eng. Bot. I shall not hesitate to cut down Usnea and 
Ramalina to one species, all the intermediate forms of every- 
day occurrence. 
