Wi-Fi problems

Hi,
i’ve just installed Volumio on my Raspberry Pi B+, but i’ve a problem with Wi-Fi adapters. It isn’t recognised as network interface and i want to ask if there is way to make it work.

This is the result of ifconfig:

root@volumio:~# ifconfig 
eth0      Link encap:Ethernet  HWaddr b8:27:eb:00:47:fd  
          inet addr:192.168.1.10  Bcast:192.168.1.255  Mask:255.255.255.0
          inet6 addr: fd88:e3ab:3b62:ba00:ba27:ebff:fe00:47fd/64 Scope:Global
          inet6 addr: fe80::ba27:ebff:fe00:47fd/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:2480 errors:0 dropped:0 overruns:0 frame:0
          TX packets:657 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:1290617 (1.2 MiB)  TX bytes:117100 (114.3 KiB)

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:13221 errors:0 dropped:0 overruns:0 frame:0
          TX packets:13221 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:1177944 (1.1 MiB)  TX bytes:1177944 (1.1 MiB)

And there lsusb

root@volumio:~# lsusb
Bus 001 Device 002: ID 0424:9514 Standard Microsystems Corp. 
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 003: ID 0424:ec00 Standard Microsystems Corp. 
Bus 001 Device 004: ID 0baf:011b U.S. Robotics Wireless MAXg Adapter [Broadcom 4320]

Thanks, sorry for my bad english.