R help - Nov 2013 - ggplot2: geom_boxplot. Mapping aes factor but with different color scale and hatching

Dear all,

I have a geom_boxplot where I have the boxes colored according to a factor. The
color scale given is very lovely and colorful, but I need it in grayscale. how
do I change this?
I also am worried that the grayscale may be too similar (black/white is also not
an option as in my real data I have much more than the two dummy factors I have
put in the dummy data). Therefore, I would like to hatch the boxes also mapped
according to the factors (see script and data below). How can I accomplish this?
Also, I have a problem that I though would be easy to solve over Stack Overflow,
but turn out to be more complex. i would like to have one of my legend titles in
italics. Sounds basic, but can't solve it somehow. I have marked in the
script below where this is.

Many thank's for your help!

Dummydata:
mydata <- data.frame(
  D15N = c(runif(100, min = -2), runif(100), runif(100, max = 2), runif(100)),
  Year = rep(c('2007', '2008'), each = 100),
  SampleType = rep(c('cyano', 'seston'), each = 200),
  Station = sample(c('B1', 'H2', 'H3', 'H4'),
400, replace = TRUE),
  Week = sample(c('19', '21', '23', '25'), 400,
replace = TRUE))

library(ggplot2)

Summdata <- ddply(mydata, .(Week, SampleType, Year, Station), summarise,
median = median(D15N))

ggplot(Summdata, aes(x = Station, y = median)) +
  (mapping=aes(group=interaction(Station, SampleType)))+
  theme_bw() +
  geom_boxplot(mapping=aes(fill=SampleType), #I would like to have grayscale and
hatched - how?
               outlier.shape=1,
               outlier.size=3)+
  theme(strip.background = element_blank())+
  ylab(expression(paste("",delta^{15}, "N")))+
  xlab("Station") +
  scale_shape(solid = FALSE)+
  geom_hline(yintercept=0, linetype=3)+
  scale_fill_discrete(guide = guide_legend("my stuff"),
                      labels=c("cyanobacteria", "seston"))
#if I wanted to have "seston" in italics - how would I do that?


with kind regards

Anna Zakrisson
PhD student

Department of Ecology, Environment and Plant Sciences
Stockholm University
Svante Arrheniusv. 21A
SE-106 91 Stockholm
Sweden/Sverige

Lives in Berlin.
For paper mail:
Katzbachstr. 21
D-10965, Berlin - Kreuzberg
Germany/Deutschland

E-mail: anna.zakrisson@su.se
Tel work: +49-(0)3091541281
Mobile: +49-(0)15777374888
LinkedIn: http://se.linkedin.com/pub/anna-zakrisson-braeunlich/33/5a2/51b
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