font available for fc-list is not listed in SystemPreferencs.app

[Zhang Weiwu]

My font does exist in my system:

$ fc-list  | grep -i wen
WenQuanYi Bitmap Song:style=Bold
WenQuanYi Bitmap Song:style=Regular
$ xlsfonts | grep wen | awk -F - '{print $3;}' | uniq
wenquanyi bitmap song

But it is not shown in SystemPreferencs.app as attached snapshot. What could be the reason? 

Thanks (in advance).

Full output of fc-list follows as reference just in case it is useful:

Tibetan Machine Uni:style=Regular
Liberation Mono:style=Regular
LucidaBright:style=Italic
Nimbus Sans L:style=Regular Italic
WenQuanYi Bitmap Song:style=Bold
Bitstream Vera Sans Mono:style=Bold
URW Palladio L:style=Roman
Century Schoolbook L:style=Bold Italic
Liberation Sans:style=Regular
DejaVu Sans Mono:style=Bold Oblique
Evermore Hei,永中黑体:style=Regular
Liberation Serif:style=Bold Italic
LucidaTypewriter:style=Sans Bold
Fixed:style=Bold
Bitstream Vera Sans:style=Oblique
DejaVu Serif:style=Bold Italic
fangsong,新华仿宋体:style=Regular
Nimbus Sans L:style=Bold
Times:style=Bold Italic
Clean:style=Regular
OpenSymbol:style=Regular
DejaVu Serif Condensed:style=Book
DejaVu Serif Condensed:style=Bold
ClearlyU PUA:style=Regular
URW Chancery L:style=Medium Italic
Bitstream Vera Sans:style=Roman
Charter:style=Bold Italic
Bitstream Charter:style=Bold Italic
DejaVu Sans Condensed:style=Book
DejaVu Sans Condensed:style=Bold Oblique
DejaVu Sans Condensed:style=Bold
DejaVu Sans:style=Bold Oblique
Nimbus Roman No9 L:style=Regular
Evermore CuHei,永中粗黑:style=Regular
Century Schoolbook L:style=Bold
Century Schoolbook L:style=Italic
Nimbus Sans L:style=Regular
FreeSerif:style=Bold,polkrepko
Courier:style=Regular
URW Palladio L:style=Italic
Charter:style=Bold
Helvetica:style=Oblique
LucidaBright:style=Regular
Nimbus Sans L:style=Bold Condensed
Terminal:style=Bold
URW Gothic L:style=Demi
Liberation Serif:style=Bold
FreeSerif:style=Italic,ležeče
Liberation Mono:style=Bold Italic
Nimbus Roman No9 L:style=Medium Italic
Bitstream Charter:style=Regular
Fixed:style=Bold SemiCondensed
Nimbus Mono L:style=Bold Oblique
FreeSans:style=Medium,navadno
Dingbats:style=Regular
Fixed:style=SemiCondensed
Evermore Kai,永中楷体:style=Regular
Bitstream Vera Sans Mono:style=Oblique
Nimbus Roman No9 L:style=Medium
Times:style=Bold
Nimbus Sans L:style=Bold Italic
Courier 10 Pitch:style=Bold Italic
Charter:style=Italic
AR PL SungtiL GB,文鼎ＰＬ简报宋:style=Regular
DejaVu Sans:style=Oblique
Nimbus Mono L:style=Regular
FreeSans:style=Oblique,ležeče
Courier:style=Oblique
Bitstream Charter:style=Italic
Newspaper:style=Regular
URW Gothic L:style=Book
Times:style=Italic
ClearlyU:style=Regular
Lucida:style=Sans Bold
Bitstream Vera Sans:style=Bold
Fixed:style=Oblique SemiCondensed
Liberation Sans:style=Bold
DejaVu Sans Mono:style=Oblique
FreeMono:style=BoldOblique,Negreta cursiva,tučné kurzíva,fed kursiv,Fett 
Kursiv,Έντονα Πλάγια,Negrita Cursiva,Lihavoitu Kursivoi,Gras Italique,Félkövér 
dőlt,Grassetto Corsivo,Vet Cursief,Halvfet Kursiv,Pogrubiona kursywa,Negrito 
Itálico,Полужирный Курсив,Tučná kurzíva,Fet Kursiv,Kalın İtalik,polkrepko 
ležeče,Lodi etzana
Fixed:style=Oblique
LucidaTypewriter:style=Sans
New Century Schoolbook:style=Bold
ClearlyU Alternate Glyphs:style=Regular
Courier 10 Pitch:style=Italic
Courier:style=Bold Oblique
Liberation Serif:style=Regular
Lucida:style=Sans Italic
Bitstream Vera Serif:style=Roman
Lucida:style=Sans
Bitstream Vera Sans Mono:style=Bold Oblique
Liberation Sans:style=Bold Italic
Bitstream Vera Sans:style=Bold Oblique
Nimbus Sans L:style=Regular Condensed Italic
FreeSans:style=Bold,polkrepko
URW Bookman L:style=Demi Bold
URW Bookman L:style=Light
FreeMono:style=Bold,Negreta,tučné,fed,Fett,Έντονα,Negrita,Lihavoitu,Gras,Félkövér,Grassetto,Vet,Halvfet,Pogrubiony,Negrito,Полужирный,Fet,Kalın,polkrepko,đậm,Lodia
Helvetica:style=Bold
URW Gothic L:style=Demi Oblique
Times:style=Regular
Standard Symbols L:style=Regular
kai,新华楷体:style=regular
New Century Schoolbook:style=Bold Italic
Bitstream Vera Sans Mono:style=Roman
FreeMono:style=Medium,Normal,obyčejné,Standard,Κανονικά,Normaali,Normál,Normale,Standaard,Normalny,Обычный,Normálne,navadno,thường,Arrunta
FreeSerif:style=Medium,navadno
Courier 10 Pitch:style=Regular
Lucida:style=Sans Bold Italic
Liberation Mono:style=Bold
Helvetica:style=Regular
URW Palladio L:style=Bold
DejaVu Sans Condensed:style=Oblique
Nimbus Sans L:style=Regular Condensed
AR PL Mingti2L Big5,文鼎ＰＬ細上海宋:style=Reguler,Regular
Evermore FangSong,永中仿宋:style=Regular
URW Bookman L:style=Light Italic
WenQuanYi Bitmap Song:style=Regular
Century Schoolbook L:style=Roman
DejaVu Sans Light:style=ExtraLight
FreeSerif:style=BoldItalic,polkrepko ležeče
Nimbus Roman No9 L:style=Regular Italic
Charter:style=Regular
Courier 10 Pitch:style=Bold
DejaVu Sans:style=Bold
DejaVu Sans:style=Book
Terminal:style=Regular
Fixed:style=ko
URW Gothic L:style=Book Oblique
Fixed:style=ja
URW Palladio L:style=Bold Italic
Fixed:style=Regular
song,新华宋体:style=Regular
Helvetica:style=Bold Oblique
New Century Schoolbook:style=Italic
DejaVu Serif:style=Italic
Nimbus Mono L:style=Regular Oblique
Bitstream Vera Serif:style=Bold
AR PL KaitiM GB,文鼎ＰＬ简中楷:style=Regular
DejaVu Sans Mono:style=Book
DejaVu Sans Mono:style=Bold
Courier:style=Bold
Liberation Serif:style=Italic
Nimbus Mono L:style=Bold
FreeSans:style=BoldOblique,polkrepko ležeče
Liberation Mono:style=Italic
Bitstream Charter:style=Bold
FreeMono:style=Oblique,Cursiva,kurzíva,kursiv,Πλάγια,Kursivoitu,Italique,Dőlt,Corsivo,Cursief,Kursywa,Itálico,Курсив,İtalik,ležeče,nghiêng,Etzana
STsuperfont,宋一超大字库:style=Regular
DejaVu Serif Condensed:style=Bold Italic
hei,新华黑体:style=Regular
New Century Schoolbook:style=Regular
Nimbus Sans L:style=Bold Condensed Italic
URW Bookman L:style=Demi Bold Italic
Liberation Sans:style=Italic
DejaVu Serif:style=Book
Evermore Song,永中宋体:style=Regular
DejaVu Serif:style=Bold